As far as I understand, without special care, then by default when you use code that produces dynamic SQL and runs it, the database executes the dynamic SQL under the rights of the caller. Implementing PostgreSQL User-Defined Table Functions PostgreSQL SQL Tricks This is exemplary example of … To return a table from the function, you use RETURNS TABLE syntax and specify the columns of the table. Each column is separated by a comma (, ). In the function, we return a query that is a result of a SELECT statement. Notice that the columns in the SELECT statement must match with the columns of the table that we want to return. Example 3: Using SQL Identifier in Dynamic SQL. It uses an interface that defines an argument and return type of function, as we have stated in the function’s syntax. The main body does a loop over the group by query stated setting r to each row in sequence. It uses an interface that defines an argument and return type of function, as we have stated in the function’s syntax. When you can call an overloading function, PostgreSQL select the best candidate function to execute based on the the function argument list. The docs show no … It would be impossible to guarantee that property if a function could independantly and dynamically decide what structure it … Example 4: Using dynamic SQL inside PostgreSQL function. PostgreSQL - Temporary Table - GeeksforGeeks In a prior article Use of Out and InOut Parameters we demonstrated how to use OUT parameters and INOUT parameters to return a set of records from a PostgreSQL function. CREATE OR REPLACE FUNCTION dynamic_trigger() RETURNS TRIGGER LANGUAGE plpgsql AS $$ DECLARE ri RECORD; t TEXT; BEGIN RAISE NOTICE E'\n Operation: %\n Schema: %\n Table: %', TG_OP, TG_TABLE_SCHEMA, TG_TABLE_NAME; FOR ri IN SELECT ordinal_position, column_name, data_type FROM information_schema.columns WHERE table_schema = … *) and RETURNS TABLE (foo), which didn't work. Following is a breakdown of the above Postgres PLpgsql function: A function named get_stock is created, This requires a single-parameter ‘prod_pattern’ that defines the pattern designed to match the product’s name.. Upon return, the caller could browse the resulting rows with FETCH. select select_listname into variable_name from table_name; In such cases, dynamic SQL is very convenient. For example, in the car portal application, the search functionality is needed to get accounts using the dynamic predicate, as follows: CREATE OR REPLACE FUNCTION car_portal_app.get_account (predicate TEXT) RETURNS SETOF car_portal_app.account AS $$ BEGIN RETURN QUERY EXECUTE 'SELECT * … In practice, you often process each individual row before appending it in the function’s result set. same theme of running dynamic SQL from a variable with the EXECUTE statement. A temporary table, as the name implies, is a short-lived table that exists for the duration of a database session. PostgreSQL allows multiple functions to share the same name as long as they have different arguments. Method 2: Using the quote indent function. Using the example for the above link, can the following be rewritten using RETURNS TABLE: CREATE TABLE foo (fooid int, foosubid int, fooname text); CREATE FUNCTION getfoo(int) RETURNS SETOF foo AS $$ SELECT * FROM foo WHERE fooid = $1; $$ LANGUAGE SQL; So far, I tried to use RETURNS TABLE (foo.