Pl sql trigger inserting deleting updating

Again, a solution is to use another language; this time a trusted variant could also work.

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 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.

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

Again, a solution is to use another language; this time a trusted variant could also work.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 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.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) != 16 then exit; end if; _char := substring(_str from i for 1); if _char !Usually "simple SQL" expressions are used - Postgre SQL can evaluate it much faster than full SQL statement, but still slower than truly compiled integrated functionality.

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Again, a solution is to use another language; this time a trusted variant could also work.

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 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.

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) !

= 16 then exit; end if; _char := substring(_str from i for 1); if _char !

Usually "simple SQL" expressions are used - Postgre SQL can evaluate it much faster than full SQL statement, but still slower than truly compiled integrated functionality.

So - importantly - think first and use integrated functionality everywhere when it is possible.

; _char text; i int4; begin i=1; while true loop if length (_str) !

= 16 then exit; end if; _char := substring(_str from i for 1); if _char !

Usually "simple SQL" expressions are used - Postgre SQL can evaluate it much faster than full SQL statement, but still slower than truly compiled integrated functionality.

So - importantly - think first and use integrated functionality everywhere when it is possible.

PL/pg SQL is the most frequently used language for writing stored procedures.Code in stored procedures must be absolutely non-interactive.Since most applications need some level of interaction, user experiences suggest it is not a good design to try to write an application entirely through stored procedures.You can implement it in PL/pg SQL without any problem, but your code will be always slower (sometimes significantly slower) than simple SQL function that uses integrated quicksort: PL/pg SQL does not create new types or its own functions. PL/pg SQL functions can contains almost all of SQL statements.It has a FOR statement for iteration over SELECT's result. Authors were surely inspired by the PL/SQL language, which is the native programming language for Oracle RDBMS, so it’s not difficult to convert stored procedures from Oracle to Postgre SQL or back.PL/pg SQL is not useful to create general triggers.

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