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If you don't specify IN, OUT, or INOUT for the parameter, it will default to IN. | |
An IN parameter is passed into the stored procedure to use internally. | |
An OUT parameter is set within the procedure, but accessed by the caller. | |
An INOUT parameter is passed into the procedure for internal use, but is also available to the caller after the procedure has completed. | |
The name and data type of the parameter are used in the stored procedure for referencing and setting values going in and out of the procedure. | |
The data type can be any valid data type for MySQL. |
