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PostgreSQL - Array Function
PostgreSQL ARRAY_AGG function is used to concatenate the input values including null into an array.
To understand the ARRAY_AGG function, consider the table COMPANY having records as follows −
testdb# select * from COMPANY; id | name | age | address | salary ----+-------+-----+-----------+-------- 1 | Paul | 32 | California| 20000 2 | Allen | 25 | Texas | 15000 3 | Teddy | 23 | Norway | 20000 4 | Mark | 25 | Rich-Mond | 65000 5 | David | 27 | Texas | 85000 6 | Kim | 22 | South-Hall| 45000 7 | James | 24 | Houston | 10000 (7 rows)
Now, based on the above table, suppose you want to use the ARRAY_AGG, you can do so by using the following command −
testdb=# SELECT ARRAY_AGG(SALARY) FROM COMPANY;
The above given PostgreSQL statement will produce the following result −
array_agg
---------------------------------------------
{20000,15000,20000,65000,85000,45000,10000}
postgresql_useful_functions.htm
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