How to create a procedure in PostgreSQL by example?

How to create a procedure in PostgreSQL by example?

The following illustrates the basic syntax of the create procedure statement: First, specify the name of the stored procedure after the create procedure keywords. Second, define parameters for the stored procedure. A stored procedure can accept zero or more parameters.

Which is the procedural language for a stored procedure?

A stored procedure can accept zero or more parameters. Third, specify plpgsql as the procedural language for the stored procedure. Note that you can use other procedural languages for the stored procedure such as SQL, C, etc.

Is the PostgreSQL stack exchange off topic?

Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Database Administrators Stack Exchange. Closed 2 years ago. I couldn’t get my first stored procedure to work, so I copied this example from the manual: What am I doing wrong?

Can you return a value from a stored procedure?

A stored procedure does not return a value. You cannot use the return statement with a value inside a store procedure like this: However, you can use the return statement without the expression to stop the stored procedure immediately: If you want to return a value from a stored procedure, you can use parameters with the inout mode.

Which is the procedural language used in PostgreSQL?

PL/pgSQL — SQL Procedural Language Chapter 42. PL/pgSQL — SQL Procedural Language 42.1. Overview 42.1.1. Advantages of Using PL/pgSQL

How to get the result of a PostgreSQL query?

Executing a Query with a Single-Row Result 42.5.4. Executing Dynamic Commands 42.5.5. Obtaining the Result Status 42.5.6. Doing Nothing At All 42.6. Control Structures 42.6.1. Returning from a Function 42.6.2. Returning from a Procedure 42.6.3. Calling a Procedure 42.6.4. Conditionals 42.6.5. Simple Loops 42.6.6. Looping through Query Results

Do you have to return NULL in PostgreSQL?

If a RETURN statement is desired to exit the code early, then NULL must be returned. Returning any other value will result in an error. You could mark your parameters as output though, so that they would behave like variables.

Can a procedure end without a return statement?

Following the docs on Postgres 11 (bold emphasis mine): A procedure does not have a return value. A procedure can therefore end without a RETURN statement. If a RETURN statement is desired to exit the code early, then NULL must be returned.