Note that postgresql does not have stored procedure, they have function. (See DISTINCT Clause below.) The inherent problem is that SQL (all SQL not just Postgres) requires that a subquery used within a select clause can only return a single value. For example, SELECT x, generate_series(1,5) AS g FROM tab; is almost equivalent to Use PL/pgSQL in PostgreSQL outside of a stored procedure or function? SELECT raises exception in PL/pgSQL function; A PROCEDURE (Postgres 11 or later) returns a single row if it has any arguments with the INOUT mode. zsheep already provided an example. The newest releases of PostgreSQL are … The select clause is returning rows and a certain number of columns, each row.column location is a single position within a grid. Consider a DO statement to run ad-hoc plpgsql code without passing or returning anything. The function returns a query that is the result of a select statement. Some other database systems offer a FROM option in which the target table is supposed to be listed again within FROM.That is not how PostgreSQL interprets FROM.Be careful when porting applications that use this extension. PostgreSQL 's behavior for a set-returning function in a query's select list is almost exactly the same as if the set-returning function had been written in a LATERAL FROM-clause item instead. Compatibility. Because the data type of release_year column from the film table is not integer, you need to cast it to an integer using the cast operator ::. Return pre-UPDATE Column Values Using SQL Only - PostgreSQL Version; The same is currently not possible for INSERT.Per documentation: The expression can use any column names of the table named by table_name. PostgreSQL ‘SELECT AS’ The PostgreSQL SELECT AS clause allows you to assign an alias, or temporary name, to either a column or a table in a query. Using the operators UNION, INTERSECT, ... PostgreSQL allows it in any SELECT query as well as in sub-SELECTs, but this is an extension. The RETURNING keyword in PostgreSQL gives you an opportunity to return, from the insert or update statement, the values of any columns after the insert or update was run. * PostgreSQL Stored Procedures and Functions - Getting Started To return one or more result sets (cursors in terms of PostgreSQL), you have to use refcursor return type. The optional RETURNING clause causes DELETE to compute and return value(s) based on each row actually deleted. They are equivalent. If you think about that restriction for a while it does makes sense. table_name being the target of the INSERT command. Coming from Microsoft SQL Server, I keep on forgetting how to return a resultset from a stored procedure in postgresql. Select alias from column. Needs a bit more code than SQL Server. The syntax of the RETURNING list is identical to that of the output list of SELECT. This command conforms to the SQL standard, except that the FROM and RETURNING clauses are PostgreSQL extensions, as is the ability to use WITH with UPDATE.. The alias is displayed when the query returns … Any expression using the table's columns, and/or columns of other tables mentioned in USING, can be computed. The following example creates an alias for a column name using AS. This would be simpler for UPDATE, where additional rows joined into the update are visible to the RETURNING clause:. Here is a small sample of how to do it. SELECT ALL (the default) will return all candidate rows, including duplicates. Note that the columns in the result set must be the same as the columns in the table defined after the returns table clause. 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