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How do I dump all functions in PostgreSQL?
pg_getfunctiondef was added in PostgreSQL 8.4. SELECT pg_get_functiondef(‘proc_name’::regproc); To dump all functions in a schema you can query the system tables in pg_catalog ; say if you wanted everything from public : SELECT pg_get_functiondef(f.
What is return in PostgreSQL?
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.
What does insert into return?
INSERT inserts new rows into a table. One can insert one or more rows specified by value expressions, or zero or more rows resulting from a query. When you insert data into a table, you can use the OUTPUT clause to return a copy of the data that’s been inserted into the table. …
How do I return multiple result sets in PostgreSQL?
A simpler way has been around since PostgreSQL 8.3: CREATE FUNCTION test() RETURNS SETOF first_table AS $func$ BEGIN RETURN QUERY SELECT * FROM first_table; RETURN QUERY SELECT * FROM second_table; — has to return same rowtype as first_table!
Can we write return in procedure?
You can use one or more RETURN statements in a stored procedure. The RETURN statement can be used anywhere after the declaration blocks within the SQL-procedure-body. To return multiple output values, parameters can be used instead. Parameter values must be set prior to the RETURN statement being executed.
What is the return function in PostgreSQL 10?
PostgreSQL 10 is now available for everyone to use, and hinted by David Fetter I had to review my previous article on Json and SQL to adapt to Set Returning Functions changes. A Set Returning Function is a PostgreSQL Stored Procedure that can be used as a relation: from a single call it returns an entire result set, much like a subquery or a table.
When to return in reverse order in PostgreSQL?
When reverse is true, the series is returned in reverse order. generate_subscripts is a convenience function that generates the set of valid subscripts for the specified dimension of the given array.
Are there any functions that return more than one row?
This section describes functions that possibly return more than one row. The most widely used functions in this class are series generating functions, as detailed in Table 9.61 and Table 9.62. Other, more specialized set-returning functions are described elsewhere in this manual.
When to use SRF in PostgreSQL case construct?
Lazy enough to use an SRF in a scalar context, within the CASE construct. In previous PostgreSQL versions, the SQL engine would then expand the select output into as many rows as returned by the jsonb_array_elements () call.