Updating of new row is not allowed in after trigger blind dating shower

11 Jan

There are optional declaration and exception sections, like any other PL/SQL block, if required.

The "dml-event" can be one or more of the following.

Usage constraints cannot always be expressed by SQL’s integrity constraint statements. For example, it is not possible to use a check constraint to prevent data inserts or deletes on weekends.

A trigger can be used to enforce the time when each operation is allowed.

A trigger that causes an exception if the value inserted in a column is negative is such an example.

A check constraint that declares (declarative) is a better way of expressing an integrity constraint than a trigger that throws an exception if the same condition is false.

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The CREATE TRIGGER statement is used to add triggers to the database schema.

Triggers are database operations that are automatically performed when a specified database event occurs.

The CREATE TRIGGER statement has a lot of permutations, but the vast majority of the questions I'm asked relate to basic DML triggers.

Of those, the majority are related to people misunderstanding the order of the timing points and how they are affected by bulk-bind operations and exceptions.