SQL Server| Fix Error | Msg 201, Level 16, State 4, Line 1 Expect Parameter Not Supplied #sqlserver

SQL Server| Fix Error | Msg 201, Level 16, State 4, Line 1 | Expect Parameter Not Supplied
https://youtu.be/rkiCyaeBfVk
#sql #fixerror #errormsg #msg #msg201 #level16 #expect #parameter

Causes
As the message suggests, this error occurs when executing a stored procedure or a user-defined function that expects a parameter that was not supplied and the parameter does not have a default value specified during creation. If the parameter has a default value assigned, this error message will not occur for that particular parameter

To illustrate, the following call to the GetStudentData stored procedure will generate the error if no parameter is passed:

exec GetStudentData

Server: Msg 201, Level 16, State 4, Line 1

The simplest way to avoid this error is to make sure that all parameters expected by a stored procedure or function that don’t have any default values are assigned a value and that the name of the parameter if specified, matches the name of the parameter as defined in the stored procedure or function.

To know what parameters are expected by a stored procedure or function, the sp_help system stored procedure can be used, passing the name of the stored procedure or function as a parameter. The sp_help system stored procedure reports information about a database object, a user-defined data type or a data type.

There are 3 ways of passing parameters to a stored procedure. The first method is using the “@parametername=value” convention wherein the name of the parameter is passed together with the value. Here’s a sample using the sp_change object owner system stored procedure:

exec GetStudentData @studid ='1'

The second method is by simply passing the parameter value without the parameter name. Using the same GetStudentData, here’s how the call to the GetStudentData will look like using this method:

exec GetStudentData '1'

Using the second method, you must pass the parameter values in the same order as the parameters as specified in the stored procedure. In the first method, the order of the parameters need not match the order of the parameters list of the stored procedure.

The preferred method between these two is the first method where the parameter value is passed together with the parameter name. Using the “@parametername = value” convention, even if new parameters with default values are added in a stored procedure somewhere in the parameter list not necessarily at the end, the call to the stored procedure will still work and generate the expected result. Also, the list of parameters in the stored procedure definition can also be rearranged without affecting any calls to it.

In the Third method, you must define a predefined value for the parameter in the procedure so the user does not need to assign a value when it is execution time.

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