Postgresql function return select result

CREATE OR REPLACE FUNCTION get_all_foo() RETURNS SETOF foo AS. The following function returns all films whose titles match a particular pattern using. In the function , we return a query that is a result of a SELECT statement. An introduction on writing stored function in postgresql. NEXT must specify a record or row variable in function returning tuple at or near QUERY.

The function needs to return a SETOF RECORD instead of. Since your function returns a single row by definition, the value is also returned only once. Other columns would be NULL in this case. Object as the result type, and generate the functions as deprecate but . The suggest that what I thought was the case as described in . RETURNS TABLE(test_id integer, test_stuff text) AS $$ SELECT i. Of course, the below query works just fine, returning the correct. If singleton, first row of last query result returned , NULL on no result.

This function used to be called pg_numrows(). PostgreSQL provides four kinds of functions : SQL. Postgres functions can return cursors too, but using them afterwards. Obviously they can return rows like a table, so why not just write everything as a query.

Our test VM was able to survive until the 40000th result before . VARCHAR) AS $$ BEGIN RETURN QUERY SELECT employee. A trigger function takes no parameters, and the return type must be. Executing a Query with a Single-row Result.

So that is pretty simple, we run select queries, and return the refcursor for . In case of STABLE the function is going to return the same result given the same parameters . Select the Schema and Return Type from the list. Enter the table columns if the return type is set to TABLE. It used to be possible to use SRF in the SELECT clause, with dubious . These functions let Postgres server to return JSON serialized data.

First, do an inner join, then select the desired columns , and finally convert to JSON using . Since month and channel are the first two values in your SELECT. RECORD that allows you to return only a few columns of your interest. It includes a JSON data type and two JSON functions. While this does return only the id and text columns , unfortunately it loses the field . Turns out the database has to prepare the query plan before it knows about the parameters, which leads to bad.

How we can calculate how much columns hold a NULL value? Table inheritance allows extracting a common set of columns into a parent table with. It provides many functions and operators for manipulating JSON data. We can use the JSON operators in WHERE clause to filter the returning rows. It is not possible to identify of dynamic queries - so plpgsql_check.

This will allow us to instruct Postgres to return all of the data it. If we want to see the columns that make up the city table, we can issue this . That is, ARRAY expects to get rows as its input, and returns a single row, containing a. Now, the ARRAY function needs to be invoked via a SELECT. As you can see, this query is quite fast and returns data in less than ms.