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		There are lots of related articles and comments about this topic.
 You need to read PLSQL tutorials, in the first place.
 
 Basically, functions must return a value. However, retuning a value is not a must for procedures.
 A stored procedure cannot be used in a select statement. The functions, however; can be used in a select statement .
 Packages are collections of procedures, functions, types, and variables.
 
 
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