Validating date in oracle dating a mature woman
to be no larger than 12 (for the month) and the second ?? If all pass, then to assembly a date-typed value by using the "add_months()" function to build the year and month, and using the " " function to build the date.This example assumes the date format to be "MM-DD-YYYY". The DBA must develop database-centric methods to ensure data quality formats, like this constraint to ensure that all credit card values are properly formatted: But in the real-world multiple column values have to be compared to ensure data quality.Multi-column validation happens when one column value is compared to another column value to determine validity.
Data quality control is one of the most important jobs of the Oracle DBA, and Oracle provides sophisticated tools to ensure data quality and many of them can be placed "inside" the database schema, like this simple constraint that ensures that names only contain alphabetic characters: But data quality control is far more than controlling simple data column values.
For example, consider a table where we want to ensure that a customer with a salutation of "Ms." Has a matching gender column of "F" for female: In this case an "insert trigger" is required to compare and validate the data columns for internal consistency.
The Oracle trigger syntax allow you to apply Boolean logic to compare the internal consistency of each incoming row: But the real "meat" of Oracle data quality control (called "data cleansing", a.k.a.
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RETURN 1; EXCEPTION WHEN OTHERS THEN -- If you get here the string is an invalid date. Every time I start thinking I know what I'm doing I realise how little I know I mostly do Oracle DBA and development work.