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Again as the name suggests these are the type of triggers which are created over DDL statements such as CREATE or ALTER and get fired either before or after execution of your DDL statements.

Using this type of trigger you can monitor the behavior and force rules on your DDL statements.

Tables are made up of rows of data, each consisting of one or more columns, so it stands to reason that Oracle Database would make it as easy as possible to work with those rows of data inside a PL/SQL program.

And it does precisely that through its implementation of the datatype, such as a number or string.

In this tutorial I will try to explain you the concepts of triggers, and try to give you the answers of almost all the questions which you might face in your Certification Exam or in your Interview.

Triggers are named PL/SQL blocks which are stored in the database or we can also say that they are specialized stored programs which execute implicitly when a triggering event occurs [Click Here To Tweet This] which means we cannot call and execute them directly instead they only get triggered by events in the database.

You can capture information at four timing points using this trigger: (a) before the firing statement; (b) prior to change of each row from the firing statement; (c) post each row changes from the firing statement; (d) after the firing statement.Here are the answers to the PL/SQL Challenge questions in last issue’s “Error Management” article: Answer 1: Choices (a), (c), and (d) all raise ORA-00001, also known as DUP_VAL_ON_INDEX inside PL/SQL code.Answer 2: To make it possible for the plch_proc procedure to compile without error, change “AND” to “OR” in the WHEN clause of the exception section.It also takes a look at record types, which enable you to work with records that are not necessarily related to a relational table.PL/SQL makes it very easy to declare records that have the same structure as a table, a view, or the result set of a cursor by offering the %ROWTYPE attribute.

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