ESCAPE in DB2 Mainframes:
In SQL the percent sign(%) and the under score(_) has special meaning.
%’ – represents any set of characters
_ – under score represents any single character.
Ex: select * from emp
where email like 'reddy_%';
This will display all the email ids starting with reddy like reddy123,reddy_34 etc. But here the requirement is to display the email ids starting with ‘reddy_’.
As in db2 underscore represents a single character it displays all the mail ids starting with reddy.
In such scenarios ESACPE clause is used to get the original meaning of _ or %.
By using the ESACPE the SQL looks like below:
select * from emp
where email like ‘reddy+_%’; ESCAPE ‘+’;
Now the above SQL displays only the mail ids starting with ‘reddy_’ like reddy_123, reddy_345 etc.
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