Using function in subquery in where statement : WHERE « Select Query « PostgreSQL

PostgreSQL
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PostgreSQL » Select Query » WHERE 
Using function in subquery in where statement


postgres=# CREATE TABLE myTable (
postgres(#          id int,
postgres(#          sid int,
postgres(#          name text);
CREATE TABLE
postgres=#
postgres=# insert into myTable values(1,2,'a');
INSERT 0 1
postgres=# insert into myTable values(2,3,'b');
INSERT 0 1
postgres=#
postgres=# select from myTable;
 id | sid | name
----+-----+------
  |   | a
  |   | b
(rows)

postgres=#
postgres=#
postgres=# CREATE FUNCTION getData(intRETURNS SETOF myTable AS $$
postgres$#    SELECT FROM myTable WHERE id = $1;
postgres$# $$ LANGUAGE SQL;
CREATE FUNCTION
postgres=#
postgres=# SELECT FROM myTable
postgres-#    WHERE sid IN (select sid from getData(myTable.idz
postgres(#                           where z.id = myTable.id);
 id | sid | name
----+-----+------
  |   | a
  |   | b
(rows)

postgres=#
postgres=# drop function getData(int);
DROP FUNCTION
postgres=# drop table myTable;
DROP TABLE
postgres=#
           
       
Related examples in the same category
1. A simple WHERE clause
2. Combining conditions in the WHERE clause
3. Grouping WHERE conditions with parentheses
4. WHERE clause contains a Boolean (truth value) expression
5. Use subquery in where statement
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