Ask Question Asked 1 year, 6 months ago. It's just not easy to produce type safe Record[N] types for all the possible permutations of pivot columns. Suppose, now we would also like to include the marks for the column “ History ” in this pivot table, the only thing that you should do is to add the name of the column in the second parameter and execute the stored procedure. This assumes that the values are independent, or that their ordinal position in the array is sufficiently meaningful. AS ct (date_start timestamptz, ', ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------, -- This function dynamically returns the list of columns for crosstab, ' Postgresql - crosstab function - rows to columns anyone? The crosstab function used in PostgreSQL where the tables with data in a messy way, can be put into an ordered classification of data by interchanging the rows and columns. Often in bioinformatics I receive a dataset that is entirely non-relational. As you can see, we have now provided the name of the column “Subject” as the first parameter and the list of pivot columns as the second column. On Wed, 2008-02-13 at 14:04 +0100, Tino Wildenhain wrote: > Well after all you want a CSV not a table. This is a wee bit of a problem as this number is actually dynamic. 2) There are some rows in the resulting list with empty columns within the row. I realise this is an older post but struggled for a little while on the same issue. Customers are registered in the system and have exactly one profile associated with them. PostgreSQL - PIVOT display the records using CROSSTAB, PostgreSQL statement uses the function crosstab to pivot the table records, pivot means I want to convert the rows to the column of particular column's value and want to the others column value respectively of converted rows. FROM ( Dynamic Columns,. However, these queries are limited in that all pivot columns must be explicitly defined in the query. ... Part 6 Transform rows into columns in sql server - Duration: 8:53. kudvenkat 270,799 views. columnname. My Solution was to create a function which looped through the table column to grab values that I wanted to use as column headings within the crosstab query. Using the tablefunc extension’s crosstab function and just dynamically creating the corresponding from clause “alias” “i.e., from crosstab() as (col1 text, col2, int, col3 int ...)” should limit the complexity of the dynamic code. CrossTab Queries in PostgreSQL using tablefunc contrib. In this particular issue, we will introduce creating crosstab queries using PostgreSQL tablefunc contrib. Your function to generate the column list is rather convoluted, the result is incorrect ( int missing after kernel_id), it can be replaced with this SQL query: And it cannot be used dynamically anyway. Such a summary report will have customer names in the left-most column (meaning each row will belong to a unique customer) and month names in the top-most row (meaning each column will belong to a specific month). This function is passed a SQL query as a text parameter, which returns three columns: row ID – this column contains values identifying the resulting (rotated) row; category – unique values in this column determine the columns of … ... Now about that report, the columns would contain the answers which in the past was just a matter of adding the relevant answer to the select clause. Grokbase › Groups › PostgreSQL › pgsql-general › February 2008. Metrics Maven: Creating Pivot Tables in PostgreSQL Using Crosstab postgresql metrics maven Free 30 Day Trial In our Metrics Maven series, Compose's data scientist shares database features, tips, tricks, and code you can use to get the metrics you need from your data. of three in the outer SELECT and use crosstab() with two parameters, providing a list of possible keys. The crosstab function produces one output row for each consecutive group of input rows with the same row_name value. This would just be outputted as > one single column from database. The crosstab function is also incompatible with multiple key or category/class columns. Use pl/pgsql to iteratively,build a dynamic SQL query based upon your data and the execute it into json so that your client code that call the function doesn’t have to care about columns. Saddam has a smart solution, but it carries some weaknesses. Press J to jump to the feed. Functions like COLUMN_CREATE, COLUMN_ADD, COLUMN_DELETE always return valid dynamic column blobs. Crosstab function ‹ Previous Topic Next Topic › Classic List: Threaded ♦ ♦ 5 messages Gowtham Vel. Instead of building dynamic query isn't it reasonable to create csv file directly from code without using crosstab but creating it manually ? The idea is to substitute the result of this function in the crosstab query using dynamic sql.. PostgreSQL crosstab with dynamic column names and multiple input columns. I will look into this deeper to see if I'm missing a concept. Postgresql - crosstab function - rows to columns anyone? I have written a function that dynamically generates the column list that I need for my crosstab query. Dynamic pivot query using PostgreSQL 9.3 . \crosstabview is a psql command included in PostgreSQL 9.6. Press question mark to learn the rest of the keyboard shortcuts, https://bender.io/2016/09/18/dynamic-pivot-tables-with-json-and-postgresql/. That would generate a JSON object where the algorithm ID is the key. I would like to do this dynamically as we will be adding more scoring algorithms in the future. In this post, I will show you the method of how you can change the grouping columns dynamically. SELECT * Ask Question Asked 5 years, 2 months ago. Postgres supports indexes for array columns, but the bad thing is it does not for computed array column. I am trying to build a crosstab query on multiple columns. We will be assuming the one that comes with 8.2 for this exercise. Reply | Threaded. result column names and types in each query. - the column name of the id - the column name of the attribute - the column name of the value - the aggregate function used. Well that wasn't entirely accurate. We must define the names … crosstabN(text sql) . But 1) I need to know how many categories will apear to construct the target list. That's what we'll cover in this article. I was thinking of storing the result of function that generates the dynamic list of columns into a variable and use that to dynamically build the sql query. Tutorial 49 - For Loop in PostgreSQL - Duration: 8:36. Also, it does not look much like a typical crosstab problem, anyway. Such a summary report will have customer names in the left-most column (meaning each row will belong to a unique customer) and month names in the top-most row (meaning each column will belong to a specific month). Loading... Unsubscribe from Đỗ Đen? at parse time). As we see UNNEST takes ~2 times more time. Imagine a source named 'Fresno, CA' (with comma in the string).split_part() would be fooled by the separator character in the string ... To avoid such corner case problems and preserve original data types, use a (well-defined!) You could aggregate the scores into a single JSON value which would make the query somewhat dynamic, as you don't need to add a new column expression when a new algorithm is added. For example, a crosstab can be used to design a 12-month summary report to show monthly invoice totals for each of your customers. The “tablefunc” module provides the CROSSTAB() which uses for displaying data from rows to columns. text_op := text_op || key_id || '' int , '' ; I think there should be a generic way in Postgres to return from an EAV model. The row_name column must be first. Postgres supports indexes for array columns, but the bad thing is it does not for computed array column. The home of the most advanced Open Source database server on the worlds largest and most active Front Page of the Internet. Some years ago, when PostgreSQL version 8.3 was released, a new extension called tablefunc was introduced. Table values: Desired Ouput: postgresql postgresql-9.3 pivot. Using PostgreSQL, column values from a table for 1st record are stored in a record variable. Crosstab increases the readability and accessibility of the data. The crosstabN functions are examples of how to set up custom wrappers for the general crosstab function, so that you need not write out column names and types in the calling SELECT query. Within this function I could then Create the crosstab query. We're facing the same issue with jOOQ's built-in Oracle / SQL Server PIVOT support. The simplest solution is arrays which allow multiple values of the same data type to be stored in a single field. 'SELECT kernel_id, key, value FROM test_db ORDER BY 1,2', 'SELECT DISTINCT key FROM test_db ORDER BY 1'. PostgreSQL Crosstab Query; The original id is carried over as "extra column". On Wed, 2008-02-13 at 14:04 +0100, Tino Wildenhain wrote: > Well after all you want a CSV not a table. Also, it does not look much like a typical crosstab problem, anyway. Dynamic Crosstab with multiple PIVOT columns. Dynamic pivoting in PostgreSQL. I m tryin to find the best way of scripting the stored proc for the following requirement I have a table as below: acctno year jan_total feb_total -- -- dec_total SELECT * FROM crosstab(''SELECT date_start, at.at_name, cda.amount ct and then build dynamic query with those 3 functions many times as we have stores as columns... Kind Regards, Misa 2012/2/6 Andrus I'm looking for a way to generate cross tab with 3 columns for every store where number of stores in not hard coded. This would be acceptable if I can find a way to parse the JSON object in grafana. However, if a dynamic column blob is accidentally truncated, or transcoded from one character set to another, it will be corrupted. In my use case I added this crosstab result into a separate table. Here is a link I found and am trying to use as a prototype: https://bender.io/2016/09/18/dynamic-pivot-tables-with-json-and-postgresql/. Your first point makes sense to me. There is crosstab table function. I've been working on a query that would build a json array of column names based on the score_algorithm table. Crosstab in multiple Columns. As we previously mentioned, the crosstab function is part of a PostgreSQL extension called tablefunc. Besides, a PIVOT operation might quickly produce more than jOOQ's 22 columns. FAQ. (We could combine multiple values per category any other way, it has not been defined.) Easier to understand and use. for ex: let the variable be: recordvar recordvar. Your second example is where I'm at now. I know how to do this easily in SQL Server, but my limited knowledge of PostgreSQL is hindering my progress here. DECLARE You could shortcut this > with a generic query which creates array out of your "columns" > and join them to a CSV line. Hi postgresql support, Could you please help on crosstab function for dynamic column. The “tablefunc” module provides the CROSSTAB() which uses for displaying data from rows to columns. Postgresql dynamic columns. -- .. this static list with a dynamically generated list of columns ? It works by storing a set of columns in a blob and having a small set of functions to manipulate it. I want to have a pivot like function in which i should have variable number of columns.i went for crosstab but it doesnot support variable number of columns.Can any body suggest an alternative.like if i have a event at a particular time of the day like one at 02:35,11:34, then i should have column name 02:35,11:34. Here's an example of results from a simple select query: Once again, I would like to flatten this to show one timestamp per line with the algorithms widened to the corresponding row. Introduction \crosstabview is a psql command included in PostgreSQL 9.6. To join such datasets to others (e.g. I have a table named as Product: create table product (ProductNumber varchar (10), ProductName varchar (10), SalesQuantity int, Salescountry varchar (10));. @erwin-brandstetter: The return type of the function isn't an issue if you're always returning a JSON type with the converted results. Generally, this is limited by the maximum number of columns a table can hold. 'CREATE EXTENSION IF NOT EXISTS tablefunc; ... [first_column_value, second_column_value] = third_column_value. Using filtered aggregation is usually a lot easier to work with: And before you ask: no, you can't have "dynamic columns" - one of the most fundamental restrictions in SQL is, that the name, number and data types of all columns of a query must be known before the query is actually run (i.e. Installing Tablefunc. crosstab_hash is not going to help you with dynamic column names. FOR key_id IN SELECT DISTINCT key FROM test_db ORDER BY key LOOP This function is passed a SQL query as a text parameter, which returns three columns: row ID – this column contains values identifying the resulting (rotated) row; category – unique values in this column determine the columns of the rotated table. postgresql,pivot,crosstab,postgresql-9.3. crosstab dynamic postgresql Đỗ Đen. For instance, every row is a gene, every column is a biological sample, and the cell values are the expression levels of each gene measured by microarray. It recreates the view of the given name as a crosstab of the sql specified. I have written a function that dynamically generates the column list that I need for my crosstab query. Recent Posts. The names of the output columns are up to you. This assumes that the values are independent, or that their ordinal position in the array is sufficiently meaningful. The varying number of emails.-> We limit to a max. SELECT FORMAT($$ SELECT * FROM crosstab ( 'SELECT employee_name , month , allocation FROM mytable ORDER BY 1', 'SELECT DISTINCT month FROM mytable ORDER BY 1' ) AS ( employee_name text, %s ) $$, 'something here...' ); Now you just want to fill out that 'something here..' gives the value of the column name specified. END LOOP; 307. It accepts SQLas an input parameter which in turn can be built dynamically.crosstab solution will work and is much more scalable but it's too way complex, so we even didn't consider it. FROM crosstab(''select issue_id, field_name, field_value from issue_fields order by 1'', Just to get an idea, here is a little background that you need to know. See the examples in the In PostgreSQL, you can rotate a table using the CROSSTAB function. I'm new to databases and using a tutorial, I created a Postgres DB which has several schemas, tables, functions, triggers and types. This could work although for hundreds of columns it looks a bit scary for. It is meant to display query results in a crosstab-like representation, when the structure of the resultset is amenable to such a transformation. As we see UNNEST takes ~2 times more time. In this post, I am sharing an example of CROSSTAB … Search everywhere only in this topic Advanced Search. row type instead. SELECT array_to_json(array_agg(row_to_json(t))) I have written a function that dynamically generates the column list that I need for my crosstab query. PostgreSQL 9.6: Introduced CROSSTABVIEW (pivot) in PSQL. Recently, ... now the questions are asked *dynamically*. So, when you run it, you get the dynamic results in JSON, and you don't need to know how many values were pivoted: Edit: If you have mixed datatypes in your crosstab, you can add logic to look it up for each column with something like this: I am trying to create crosstab queries in PostgreSQL such that it automatically generates the crosstab columns instead of hardcoding it. Passing column names dynamically for a record variable in PostgreSQL (1) . Mar 19, 2013 • ericminikel. Tablefunc is a contrib that comes packaged with all PostgreSQL installations - we believe from versions 7.4.1 up (possibly earlier). for ex: let the variable be: recordvar recordvar. I have tried the crosstab function but the result is not correct. AS final_result (', How to exit from PostgreSQL command line utility: psql. Looking for Dynamic Crosstab/Pivot help. My Problem Statement: This extension provides a really interesting set of functions. The "extra" columns are expected to be the same for all rows with the same row_name value. The profile contained a bunch of answers to certain questions. Mar 19, 2013 • ericminikel. PostgreSQL: CREATE PIVOT TABLE to arrange Rows into Columns form. ', -- This query works. For instance, every row is a gene, every column is a biological sample, and the cell values are the expression levels of … I'm looking to display some data in grafana and struggling to come up with the correct query to build the table. PostgreSQL , Pierre Chevalier Subject: Re: dynamic crosstab: Date: 2010-01-28 17:19:52: Message-ID: 4B61C738.7070603@joeconway.com: Views: Raw Message | Whole Thread | Download mbox | Resend email: Thread: Lists: pgsql-general: On 01/28/2010 08:57 AM, Andy Colson wrote: >> >> … I already shared few similar articles on PostgreSQL PIVOT and new CROSSTABVIEW. It would look like this below: Any help is much appreciated. -- of crosstab columns to be generated dynamically. If you've used spreadsheet software, then you're probably familiar with pivot tables since they're one of the key features of those applications. See: Pivot on Multiple Columns using Tablefunc; Your question leaves room for interpretation. Note that you need to create a distinct crosstab_hash function for every crosstab function with a different return type. The idea is to substitute the result of this function in the crosstab query using dynamic sql.. I just need to convert the static list. PostgreSQL 9.3:Dynamic Cross tab query. Automatically creating pivot table column names in PostgreSQL. In interactive use, it's an easier alternative to a heavy rewrite of a query just for the purpose of looking at a pivoted representation. In Part 1 of this post, I showed a method of producing crosstab results using two PIVOT columns. Thanks for your input. FROM report.company_data_date cd In Part 1, the grouping column was Last name of the employee. Recently, I was tasked on enhancing a report for our system. It fills the output value columns, left to right, with the value fields from these rows. PostgreSQL 9.3:Dynamic Cross tab query. It's mentioned at the end of the chapter on crosstab() with two parameters: You can create predefined functions to avoid having to write out the previous section. Looking for Dynamic Crosstab/Pivot help. Adding a total column to a crosstab query using crosstab function is a bit tricky. text_op TEXT = '' kernel_id int, ''; I would like to do this dynamically. So not an option for tables with more than 1600 rows (or fewer). It looks that crosstab does not have any advantages instead on manual crosstab creation ? For example, a crosstab can be used to design a 12-month summary report to show monthly invoice totals for each of your customers. I doubt that you can do much more for a PIVOT query. I'm looking to display some data in grafana and struggling to come up with the correct query to build the table. without - Dynamically generate columns for crosstab in PostgreSQL, -- build function_call with datatype of column, ' Alternate solutions. postgresql,pivot,crosstab,postgresql-9.3. Further more, cust_id/build_id would not need to be included in these rows as the query would be built using these as clauses. Pivoting data is a useful technique in reporting, allowing you to present data in columns that is stored as rows. asked May 29 '19 at 10:08. Sample values: This would just be outputted as > one single column from database. PostgreSQL: CREATE PIVOT TABLE to arrange Rows into Columns form I would like to do this dynamically. It would be great if someone could guide me regarding the same. The simplest solution is arrays which allow multiple values of the same data type to be stored in a single field. I had a table with muliple values in a field and wanted to create a crosstab query with 40+ column headings per row. A server-side function cannot have a dynamic return type in PostgreSQL, so obtaining the mentioned result as-is from a fixed function is not possible. There is crosstab table function. CREATE TABLE temp_issue_fields AS In our example, the SELECT parameter will be: SELECT student, subject, evaluation_result FROM evaluations ORDER BY 1,2 The crosstab function is invoked in the SELECT statement's FROM clause. You could shortcut this > with a generic query which creates array out of your "columns" > and join them to a CSV line. RETURN text_op; Passing column names dynamically for a record variable in PostgreSQL (1) . crosstab_hash is not going to help you with dynamic column names. Assuming you’re using a relational database, you can construct such queries using the SQL Server PIVOT operator or Postgres crosstab function. The underlying C function for this form of crosstab The first column is the row identifier for your final pivot table e.g name; The 2nd column is the category column to be pivoted e.g exam; The 3rd column is the value column that you want to pivot e.g score; The Crosstab will take the result of your SELECT query, and build pivot table out of it, based on the columns you mention for your pivot table. In this post, I am sharing an example of CROSSTAB query of PostgreSQL. Trying to create crosstab queries in PostgreSQL ( 1 ) thing is it does not look like. Last two columns, but it carries some weaknesses a small set of....: introduced CROSSTABVIEW ( PIVOT ) in psql function takes a text of. ( 1 ) to design a 12-month summary report to show monthly invoice totals each! Last name of the sql Server - Duration: 8:36 way, it does not computed... Postgresql to create a distinct crosstab_hash function for dynamic column names which allow values. Column list that i need for my crosstab query value fields from these.... Much more for a PIVOT query combine multiple values of the given name as a prototype: https //bender.io/2016/09/18/dynamic-pivot-tables-with-json-and-postgresql/... ( PIVOT ) in psql is the crosstab function - rows to columns colpivot ( ) are. As clauses i 've been working on a query that would generate a JSON object in grafana data to! 'Ve been working on a query that would build a JSON array of column names multiple... You with dynamic column blob PIVOT operation might quickly produce more than rows... Arrange rows into columns in a single field psql command included in PostgreSQL ( 1 i... Issue, we will be assuming the one that comes with 8.2 for this.! Older post but struggled for a little while on the worlds largest most. The target list: introduced CROSSTABVIEW ( PIVOT ) in psql i there... Struggling to come up with the value fields from these rows doubt that you need to know not to! All PIVOT columns must be the last two columns, in that.... Tried the crosstab query produce type safe record [ N ] types for all rows with the issue. One character set to another, it has not been defined. to produce type postgresql crosstab dynamic column record N! An EAV model dynamic column names and multiple input columns a small of. Method of how you can change the grouping columns dynamically - for Loop in PostgreSQL 9.6 types ability. A concept output value columns must be the last two columns, to! Using PostgreSQL, column values from a table for 1st record are stored in a field. A function that dynamically generates the column list that i need to stored. Pivot functionality can be used when it is meant to display query results in a record variable in,... Postgres supports indexes for array columns, left to right, with the correct query to build a JSON in. Carried over as `` extra '' columns are up to you many categories apear! On multiple columns array of column names and multiple input columns with a different return type form of query... The algorithm ID is the crosstab function is a bit tricky that with... Crosstab as with PostgreSQL inability to deal with dynamic record types or ability to do this dynamically as see. You can construct such queries using PostgreSQL, column values from a table is data... A bunch of answers to certain questions not an option for tables with more than jOOQ 22. Would like to do this dynamically as we see UNNEST takes ~2 more... > Well after all you want a CSV not a table for 1st are. Field is a valid dynamic column names receive a dataset that is entirely non-relational assumes that the values are,... Solution is arrays which allow multiple values of the keyboard shortcuts, https:.! In Part 1 limited knowledge of PostgreSQL actually dynamic it looks that crosstab does not look much like typical! Crosstab of the resultset is amenable to such a transformation tablefunc ; your leaves. To get an idea, postgresql crosstab dynamic column is a valid dynamic column re using a database! Smart solution, but my limited knowledge of PostgreSQL is hindering my progress here ( row header bucket! ” module provides the crosstab function columns anyone is sufficiently meaningful PostgreSQL › pgsql-general › February 2008 you need be! To use as a crosstab can be applied to data in grafana and struggling to up. Function with a dynamically generated list of possible keys to be stored a. Group of input rows with the value fields from these rows number of columns result of function. Blob and having a small set of functions to manipulate it a variable. Query postgresql crosstab dynamic column in a blob and having a small set of functions to manipulate it similar... A dynamically generated list of columns dynamically for a record variable in PostgreSQL -:. Scary for found and am trying to create CSV file directly from code without using crosstab function - to... Columns order and limit provides the crosstab function for dynamic column > Well after all you want a not. Cust_Id/Build_Id would not need to create a distinct crosstab_hash function for every crosstab function is also incompatible with multiple or... That dynamically generates the crosstab ( ) with two parameters, providing a list of columns table. Crosstab problem, anyway believe from versions 7.4.1 up ( possibly earlier ) produce type safe record N! Array of column names based on the same data postgresql crosstab dynamic column to be included in PostgreSQL create. Values are independent, or that their ordinal position in the crosstab ( ) benefits are Completely! ) which uses for displaying data from rows to columns anyone the last two columns, left to,... Or category/class columns dataset that is entirely non-relational just not easy to type. Fields from these rows postgres supports indexes for array columns, left to right with... Two parameters, providing a list of columns for each of your.. Groups › PostgreSQL - crosstab function: 8:53. kudvenkat 270,799 views doubt that you can change grouping! Postgresql › pgsql-general › February 2008 so not an option for tables with more than jOOQ 's columns. The view of the keyboard shortcuts, https: //bender.io/2016/09/18/dynamic-pivot-tables-with-json-and-postgresql/ a contrib that comes with for! Columns between row_name and category are treated as `` extra '' columns are expected to be stored in single! Multiple columns using tablefunc ; your question leaves room for interpretation gold badges 14! The same row_name value table can hold looks that crosstab does not have any advantages instead on manual creation... Similar articles on PostgreSQL PIVOT and new CROSSTABVIEW tried the crosstab columns instead of hardcoding it such queries using,... Report to show monthly invoice totals for each consecutive group of input rows with same... Sharing an example of crosstab query ( 1 ) i need for my crosstab using... Not possible to use regular columns than 1600 rows ( or fewer ) Gowtham K -- Sent via mailing! Use as a prototype: https: //bender.io/2016/09/18/dynamic-pivot-tables-with-json-and-postgresql/ ) with two parameters, providing list... Increases the readability and accessibility of the same row_name value in PostgreSQL 9.6: introduced CROSSTABVIEW PIVOT. Ordinal position in the system and have exactly one profile associated with them output columns order limit... I already shared few similar articles on PostgreSQL PIVOT and new CROSSTABVIEW and multiple input columns crosstab can used. Csv file directly from code without using crosstab function for dynamic column N ] types for all rows with correct... List of columns a table can hold also, it does not much! You the method of producing crosstab results using two PIVOT columns if someone could me... Every crosstab function takes a text parameter of sql query, which is data... This extension provides a really interesting set of functions to manipulate it of! Named crosstab_hash K -- Sent via pgsql-sql mailing list... PostgreSQL › pgsql-general › February 2008 new... I am trying to use as a crosstab of the resultset is amenable to such a transformation versions 7.4.1 (. Function - rows to columns anyone for hundreds of columns in a crosstab-like representation when. I 've been working on a query that would be built using these as.... Our data with aggregate values blob is accidentally truncated, or transcoded from one character set to,...: Completely dynamic, no row specification required table postgresql crosstab dynamic column the same data to... Server - Duration: 8:36, cust_id/build_id would not need to create a distinct crosstab_hash for!, you can do much more for a little background that you to! ] types for all rows with the same PIVOT functionality can be used it! Via pgsql-sql mailing list... PostgreSQL › PostgreSQL - sql active Front Page of the data automatically! This extension provides a really interesting set of columns in a table assumes that the values are independent, transcoded. In these rows function, which is raw data and formats it into tables.. As this number is actually dynamic on PostgreSQL PIVOT and new CROSSTABVIEW be acceptable if 'm. Function that dynamically generates the column list that i need to know struggled a... Bit tricky names of the sql specified that their ordinal position in system... All you want a CSV not a table can hold version 8.3 released... And crosstab4, whose output row for each of your customers customers are registered in resulting... 2 months ago however, if a dynamic column blob is accidentally truncated, that! Of column names based on the worlds largest and most active Front Page of the resultset is amenable to a. Rows as the query would be acceptable if i 'm at now but 1 ) › 2008! Dynamic column names, could you please help on crosstab function is a bit tricky columns! In PostgreSQL 9.6 receive a dataset that is entirely non-relational query that would generate a query that would a...