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Oracle trigger where clause updating

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A variety of SQL statements are legal inside the Trigger body, though.

create or replace trigger update_emp_thru_outemp_view instead of update on outemp referencing new as new begin update emp set ename = :new.ename, empno = :new.empno, job = :new.job, mgr = :new.mgr, hiredate = :new.hiredate, sal = :new.sal, comm = :new.comm, deptno = ( select deptno from dept where dname = :new.dname ) where empno = :old.empno; if ( sql%rowcount = 0 ) then raise_application_error ( -20001, 'Error updating the outemp view !!!

The Column list names some or all of the Trigger Table's Columns (each may appear in the list only once).

If you omit this optional subclause, the effect is as if you included an s, or aliases: one name for the old row acted on by the Trigger and/or one name for the new row acted on by the Trigger and/or one name for the old Table acted on by the Trigger and/or one name for the new Table acted on by the Trigger (each may be specified once). The execution context is "atomic" in the usual SQL sense of the word: if any action statements fail, then all action statements fail and so does the statement that caused the Trigger activation: your DBMS will return the .

PL/SQL extends SQL by adding constructs found in procedural languages, resulting in a structural language that is more powerful than SQL. All PL/SQL programs are made up of blocks, which can be nested within each other.

Typically, each block performs a logical action in he program.

It supports constructs that are common to most programming languages.

The authors have graciously allowed us to reproduce the contents of the book here. Triggers will be activated whenever you execute the appropriate SQL data-change statement on the Table, whether you want them or not.) The Trigger action time defines when you want the Trigger's action to be executed: it may be either if you want the Trigger action to occur after the Trigger event.

Because the book is about the SQL-99 standard, the contents of this and other pages in the book may not directly apply to Maria DB. statement's main parts are its Table, its event (the description of the SQL-data change statement that activates the Trigger) and its action (the SQL statements which are to be executed by the Trigger). The Trigger event defines the SQL-data change statement whose execution (on the Trigger's Table) will activate the Trigger: it may be either on Columns not in the list won't activate the Trigger).

It supports the declaration of local variables, statements to control the flow of the procedure, assignment of expression results to variables, and error handling.

My SQL Triggers We assume that you are habituated with "My SQL Stored Procedures", if not you can read our My SQL Procedures tutorial.