User Defined Function. Small snippets of code that enhnace the database engine.

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UDF’s are User Defined Function. Small snippets of code that enhnace the database engine. They are very userful for Stored Procedures.
I need to learn them as Firebird does not have any of these quality functions
COALESCE (GOD FUNCTION)
DATEFLOOR (Because date comparison is a nightmare when every date has a time component)
and other such things.
Wish me luck