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Can stored procedure return Postgres value?
A PROCEDURE can return values, but in a very limited fashion (as of Postgres 13). The manual on CALL : CALL executes a procedure. If the procedure has any output parameters, then a result row will be returned, containing the values of those parameters.
How can we return a value in stored 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.
How can I return two values from a stored procedure?
In order to fetch the multiple returned values from the Stored Procedure, you need to make use of a variable with data type and size same as the Output parameter and pass it as Output parameter using OUTPUT keyword. You can also make use of the Split function to split the comma separated (delimited) values into rows.
What is the difference between function and stored procedure in PostgreSQL?
In Postgres, the main functional difference between a function and a stored procedure is that a function returns a result, whereas a stored procedure does not. This is because the intention behind a stored procedure is to perform some sort of activity and then finish, which would then return control to the caller.
How do you call a stored procedure in PostgreSQL?
To execute PROCEDURE in PostgreSQL, use the CALL statement instead of SELECT statement. This is one of the differences between PROCEDURE and FUNCTION. postgres=# CALL procedure1 ( ‘ CREATE PROCEDURE functionality supported in PostgreSQL 11! ‘ );
How to return result set from PostgreSQL stored procedure?
PostgreSQL supports stored procedure ( not function) since version 11. I created a stored procedure like this: But when I am trying to execute this stored procedure, it does not return any data:
How to return values from a stored procedure?
In case you want to return a value from a stored procedure, you can use output parameters. The final values of the output parameters will be returned to the caller.
When do you return a row in PostgreSQL?
A PROCEDURE (Postgres 11 or later) returns a single row if it has any arguments with the INOUT mode. zsheep already provided an example. Consider a DO statement to run ad-hoc plpgsql code without passing or returning anything. Use PL/pgSQL in PostgreSQL outside of a stored procedure or function?
How are SQL statements stored in PostgreSQL database?
All SQL statements are wrapped inside a function stored in the PostgreSQL database server so the application only has to issue a function call to get the result back instead of sending multiple SQL statements and wait for the result between each call.