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How to raise an error within MySQL?
MySQL has introduced signals similar to an exception in other languages. Let us first see the syntax of signal.
SIGNAL SQLSTATE ' PredefinedValueforSignalError' SET MESSAGE_TEXT = 'AnyMessageInformation';
Above, we have set our own error message text as well.
We will apply the above query to get an error message with the help of signals.
mysql > SIGNAL SQLSTATE '42927' SET MESSAGE_TEXT = 'Error Generated';
The following is the output of the above query.
ERROR 1644 (42927): Error Generated
In the above output, ‘42927’ is a SQLSTATE and ‘Error Generated’ is an error message, which we added.
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