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What are the various types of parameter modes in a procedure ?

What are the different types of parameter modes available in plsql procedures ? Thank you for the answer in advance.

oracleparametersplsqlprocedure
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Andrew Mobbs answered

Parameters can be of type: IN - read only OUT - write - no initial value, value must be supplied by procedure INOUT - read/write - new value should be supplied by procedure

Additionally you can specify NOCOPY, which means the compiler "might" (to quote the documentation) pass by reference rather than by value.

http://download.oracle.com/docs/cd/E11882_01/appdev.112/e10472/subprograms.htm#i4107

(The SHAKEITALLABOUT mode was considered, but rejected :-) )

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