Parameters in Procedure and Functions How to pass parameters to Procedures and Functions in PL/SQL? In PL/SQL, we can pass parameters to procedures and functions in three ways. 1) IN type parameter: These types of parameters are used to send values to stored procedures. 2) OUT type parameter: These types of parameters are used to get values from stored procedures. This is similar to a return type in functions. 3) IN OUT parameter: These types of parameters are used to send values and get values from stored procedures. NOTE: If a parameter is not explicitly defined a parameter type, then by default it is an IN type parameter. Source: http://plsql-tutorial.com/plsql-passing-parameters-procedure-function.htm