CREATE OR REPLACE FUNCTION pg_temp.asterisks(n int) RETURNS SETOF text LANGUAGE plpgsql IMMUTABLE STRICT PARALLEL SAFE AS $func$ BEGIN FOR i IN 1..n LOOP RETURN NEXT repeat('*', i); END LOOP; END $func$; See: Difference between language sql and language plpgsql in PostgreSQL functions...
3. Returns Data Type: The type of data that is returned needs to be specified, for example, int, date, etc. 4.language_name: Built-in languages supported by PostgreSQL are sql and plpgsql. If the Python language pack is installed in the database, the Python language is also supported u...
TheARRAY_AGG()in PostgreSQL is a built-in aggregate function used for grouping and aggregating data. The ARRAY_AGG() function is an efficient and convenient way to aggregate data. It accepts a column as input and retrieves an array of values from all the rows in a group. It is useful ...
PostgreSQL offers several math functions such as ABS(),MOD(), ROUND(), etc. All these functions assist the users in performing mathematical operations conveniently and efficiently. If we talk about theMOD()function, it is one of the most frequently used mathematical functions that perform the mo...
Here is an example of how you could define a function with the SECURITY DEFINER attribute: CREATE OR REPLACE FUNCTION public.create_role(role_name text) RETURNS void AS $$ BEGIN EXECUTE format('CREATE ROLE %I NOLOGIN', role_name); END; $$ LANGUAGE plpgsql SECURITY DEFINER...
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Examples to Implement Sort Function in PostgreSQL Different ways to implement the sort function are given below: Basically sorting technique, we use Order by clause to sort the record from a database table, so first, we create a table by using the following statement. ...
PostgreSQL PostgreSQL UNNEST() function with Example : This function is used to expand an array to a set of rows.
I am fairly new to postgresql. I know with oracle you can use reference NEW as new Old as old in the trigger as follows; create or replace TRIGGER trg_name BEFORE INSERT ON table REFERENCING NEW AS new OLD AS old FOR EACH ROW BEGIN SELECT seq_name.NEXTVAL INTO :new.dn_id FROM DUAL...
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