What Are the Parameter Modes Supported by PL/SQL

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What Are the Parameter Modes Supported by PL/SQL? - Oracle DBA FAQ - Creating Your Own PL/SQL Procedures and Functions

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PL/SQL supports 3 parameter modes on procedure/function parameters:

IN: This is the default mode. IN parameters allow the calling code to pass values into the procedure or function.
OUT: OUT parameters allow the procedure or function to pass values back to the calling code.
IN OUT: IN OUT parameters allow the calling code to pass values into and receive values from procedure or function.

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