Updating an oracle sequence nextval

= ' ' then exit; end if; i:=i 1; _char := substring(_str from i for 1); if _char CREATE OR REPLACE FUNCTION check_phone_number(text) RETURNS boolean AS $$ BEGIN IF NOT

= ' ' then exit; end if; i:=i 1; _char := substring(_str from i for 1); if _char CREATE OR REPLACE FUNCTION check_phone_number(text) RETURNS boolean AS $$ BEGIN IF NOT $1 ~ e'^\\ \\d\\ \\d \\d \\d$' THEN RAISE EXCEPTION 'Wrong formated string "%".Expected format is 999 999 999 999'; END IF; RETURN true; END; $$ LANGUAGE plpgsql STRICT IMMUTABLE; CREATE OR REPLACE FUNCTION normalise_phone_number(text) RETURNS text AS $$ DECLARE aux text := translate($1, ' ',''); BEGIN IF aux ~ e'^\\ \\d$' THEN RETURN substring(aux FROM 2); ELSEIF aux ~ e'^\\d$' THEN RETURN aux; ELSE RAISE EXCEPTION 'Unexpected format of phone number "%".', $1; END IF; END; $$ LANGUAGE plpgsql STRICT IMMUTABLE; postgres=# select normalise_phone_number(' 420 222 222 222'); normalise_phone_number ------------------------ 420222222222 (1 row) postgres=# select normalise_phone_number(' 422'); normalise_phone_number ------------------------ 420222222222 (1 row) postgres=# select normalise_phone_number(' 420 22 222222'); ERROR: Unexpected format of phone number " 420 22 222222".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.First three parts translated by Martin Řehák, parts 4-6 translated by Karolína Lehotská, parts 7-10 translated by Lucie Prunarová, parts 11-14 translated by Zdeněk Růžička The Postgre SQL RDBMS, like any true RDBMS, allows users to create and use stored procedures.A stored procedure is database logic code, saved on the SQL server, and executed later.

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= ' ' then exit; end if; i:=i 1; _char := substring(_str from i for 1); if _char CREATE OR REPLACE FUNCTION check_phone_number(text) RETURNS boolean AS $$ BEGIN IF NOT $1 ~ e'^\\ \\d\\ \\d \\d \\d$' THEN RAISE EXCEPTION 'Wrong formated string "%".

~ e'^\ \d\ \d \d \d$' THEN RAISE EXCEPTION 'Wrong formated string "%".

PL/pg SQL supports recursion, and for not too deeps calls can provide enough to satisfy sb performance, but it is very slow for deep recursion. It is perfect example how don't use PL/pg SQL ever.In Postgre SQL, stored procedures can be created using any of these languages: SQL, Perl, Python, TCL, and PL/pg SQL.PL/pg SQL is the most frequently used language for writing stored procedures.-- 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.

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