In this post, I am sharing an example of CROSSTAB query of PostgreSQL. The “tablefunc” module provides the CROSSTAB() which uses for displaying data from rows to columns.

I already shared few similar articles on PostgreSQL PIVOT and new CROSSTABVIEW.

PostgreSQL: CREATE PIVOT TABLE to arrange Rows into Columns form

PostgreSQL 9.6: Introduced CROSSTABVIEW (pivot) in PSQL

Please check the below demonstration:

Create a required extension:

CREATE EXTENSION tablefunc;

Create sample table with data:

CREATE TEMP TABLE test_crosstab
(
    Product_Name TEXT
    ,Product_Category TEXT
    ,Product_Count INT
);

INSERT INTO test_crosstab
VALUES
('Mobile','IT',20)
,('Mobile','ELE',40)
,('Desktop','IT',50)
,('Desktop','ELE',60)
,('Laptop','IT',30)
,('Laptop','ELE',70);

Use CROSSTAB for displaying data from rows to columns:

SELECT * 
FROM CROSSTAB
(
    	'SELECT Product_Name, Product_Category, Product_Count
    	 FROM test_crosstab
    	 ORDER BY 1,2'
)AS T (Product_Name text, IT INT, ELE INT)

Result: