Validating date during insert operation in pl sql with examples

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One of the key goals when building applications is to make sure the data you enter into the database meets all your business rules.Data validation is a critical part of your application to ensure your data meets the requirements developed by your business analysts.

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A common use is to provide a primary key with a value from a sequence in a before-insert trigger.

: New and : Old Value can be differentiated in DML Statements .

Insert -- : Old = NULL : New= Inserted new value Update -- : Old = Value present in table before the Update statement Triggered : New = Given new value to Update Delete -- : Old = Value before deletion : New = NULL CREATE OR REPLACE TRIGGER get_dept BEFORE DELETE OR INSERT OR UPDATE ON employees FOR EACH ROW BEGIN DBMS_OUTPUT.

Hence, we can use easy conversion functions to convert this to hours or minutes.

However, when the minutes are not a whole number, we have the problem of trailing decimal places: We can use these Oracle SYSDATE functions to convert an elapsed time into rounded elapsed minutes, and place the value inside an Oracle table.

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