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Pl sql trigger inserting deleting updating

If there’s no other way, it’s much faster to create fields of a array by conversion table (by SRF function) into the array.

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PL/pg SQL is a very simple language and mainly very simple interpreted commands. All commands are translated to a series of SQL statements.It is simple, strong, but it cannot be used for creating custom Postgre SQL's data types.This document is designed for Postgre SQL 8.1 or higher There are some limitations on when stored procedures can be used.It is possible to use Pl/pg SQL in Postgre SQL for implementation of own aggregates or normal functions, operators, and for the implementation trigger handlers.Each new version of Postgre SQL improves the possibilities of stored procedures, so CREATE FUNCTION statement are enhanced in any Postgre SQL version too.CREATE FUNCTION statement is used to define new custom functions: CREATE [OR REPLACE] FUNCTION name ([IN|OUT|INOUT] name type [,...]) RETURNS suggest_type AS $$ $$ LANGUAGE plpgsql [IMMUTABLE | STABLE | VOLATILE] [CALLED ON NULL INPUT | RETURNS NULL ON NULL INPUT | STRICT] [EXTERNAL SECURITY INVOKER | EXTERNAL SECURITY DEFINER] to run the command(s) saved in the file.

I definitely advise against writing functions directly in psql or pg Admin.

PL/pg SQL is a simple ADA-based programming language with SQL support.

This language was significantly inspired by Oracle's PL/SQL language.

-- non recursion form CREATE OR REPLACE FUNCTION public.psqlfibnr(n integer) RETURNS integer LANGUAGE plpgsql IMMUTABLE STRICT AS $function$ DECLARE prev1 int = 0; prev2 int = 1; result int = 0; BEGIN FOR i IN 1..n LOOP result := prev1 prev2; prev2 := prev1; prev1 := result; END LOOP; RETURN result; END; $function$ -- recursion form CREATE OR REPLACE FUNCTION public.psqlfibr(n integer) RETURNS integer LANGUAGE plpgsql IMMUTABLE STRICT AS $function$ BEGIN IF n Speed of recursion calls in PL/pg SQL is not comparatable with recursion optimized languages like Javascript. SQL procedures will be faster everytime when we can use a integrated functionality.

I use a bubble sort as example - but it can be quick sort too.

The following code is an example of bad programming style (I found this code on net): create or replace function check_phone_number (text) returns boolean as $$ declare _str alias for $1; _char text; i int4; begin i=1; while true loop if length (_str) !