How to create function that returns nothing in PostgreSQL?

How to create function that returns nothing in PostgreSQL?

I want to write a function with pl/pgsql. I’m using PostgresEnterprise Manager v3 and using shell to make a function, but in the shell I must define return type. If I don’t define the return type, I’m not able to create a function.

How to avoid null values in PostgreSQL 9.6?

Use max (coalesce (logincount, 0)) to avoid NULLs. According to Postgres docs (9.6): The COALESCE function returns the first of its arguments that is not null. Null is returned only if all arguments are null. It is often used to substitute a default value for null values when data is retrieved for display, for example: Share. Improve this answer.

How to create a function that returns nothing?

CREATE FUNCTION stamp_user (id int, comment text) RETURNS void AS $$ #variable_conflict use_variable DECLARE curtime timestamp := now (); BEGIN UPDATE users SET last_modified = curtime, comment = comment WHERE users.id = id; END; $$ LANGUAGE plpgsql; declare but if you still want to do a function just add void after returns.

Is there a where clause that returns nothing?

Sample DDL below – and I hardcoded a WHERE clause that returns nothing just for illustrative purposes, ideally I want to return all usernames and the highest logincount for the user

How does the replace ( ) function work in PostgreSQL?

The following illustrates the syntax of the PostgreSQL REPLACE () function: The REPLACE () function accepts three arguments: source is a string where you want to replace. old_text is the text that you want to search and replace. If the old_text appears multiple times in the string, all of its occurrences will be replaced.

What are the arguments to the replace ( ) function?

The REPLACE () function accepts three arguments: source is a string where you want to replace. old_text is the text that you want to search and replace. If the old_text appears multiple times in the string, all of its occurrences will be replaced. new_text is the new text that will replace the old text ( old_text ).

How to return the result of a select inside a function?

I have this function in PostgreSQL, but I don’t know how to return the result of the query: