Updating procedures in pl sql
See Section 28.4, “Adding New Functions to My SQL”.
A UDF can be regarded as an external stored function. See Section 9.2.4, “Function Name Parsing and Resolution”, for the rules describing how the server interprets references to different kinds of functions.
If there is any type mismatch, variable assignments and comparisons may not work the way you expect.
To be safe, instead of hard coding the type of a variable, you should use the This program has no effect when run, because there are no changes to the database.
If you are calling the procedure from within another stored procedure or function, you can also pass a routine parameter or local routine variable as an parameter.
Routine parameters cannot be referenced in statements prepared within the routine; see Section C.1, “Restrictions on Stored Programs”.
For this reason, avoid using the names of existing SQL functions for your own stored routines.
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