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difference between store procedures and functions

发布时间 2023-08-02 18:59:33作者: Fred1987

Functions can't modify anything and must have at least one parameter. They also have to return a result. Stored procedures don't need a parameter, may modify database objects, and don't have to return a result.

Stored procedures are used to connect SQL queries in a transaction and to communicate with the outside world.

 

    1. The function must return a value but in Stored Procedure it is optional. Even a procedure can return zero or n values.

    2. Functions can have only input parameters for it whereas Procedures can have input or output parameters.

    3. Functions can be called from Procedure whereas Procedures cannot be called from a Function.


    The procedure allows SELECT as well as DML(INSERT/UPDATE/DELETE) statement in it whereas Function allows only SELECT statement in it.

Procedures cannot be utilized in a SELECT statement whereas Function can be embedded in a SELECT statement.

Stored Procedures cannot be used in the SQL statements anywhere in the WHERE/HAVING/SELECT section whereas Function can be.

Functions that return tables can be treated as another rowset. This can be used in JOINs with other tables.

Inline Function can be though of as views that take parameters and can be used in JOINs and other Rowset operations.

An exception can be handled by try-catch block in a Procedure whereas try-catch block cannot be used in a Function.

We can use Transactions in Procedure whereas we can't use Transactions in Function.