Sql server create procedure null parameter

The name of the schema to which the procedure belongs. Procedures are schema-bound. If a schema name is not specified when the procedure is created, the default schema of the user who is creating the procedure is automatically assigned. The name of the procedure. Procedure names must comply with the rules for identifiers and must be unique within the schema. This prefix is used by SQL Server to designate system procedures. Using the prefix can cause application code to break if there is a system procedure with the same name.

A local temporary procedure is visible only to the connection that created it and is dropped when that connection is closed. A global temporary procedure is available to all connections and is dropped at the end of the last session using the procedure.

Temporary names cannot be specified for CLR procedures. The complete name for a procedure or a global temporary procedure, including , cannot exceed characters.

The complete name for a local temporary procedure, including , cannot exceed characters. An optional integer that is used to group procedures of the same name. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. Numbered procedures cannot use the xml or CLR user-defined types and cannot be used in a plan guide.

A parameter declared in the procedure. Specify a parameter name by using the at sign as the first character. The parameter name must comply with the rules for identifiers. Parameters are local to the procedure; the same parameter names can be used in other procedures. One or more parameters can be declared; the maximum is 2, The value of each declared parameter must be supplied by the user when the procedure is called unless a default value for the parameter is defined or the value is set to equal another parameter.

If a procedure contains table-valued parameters , and the parameter is missing in the call, an empty table is passed in. Parameters can take the place only of constant expressions; they cannot be used instead of table names, column names, or the names of other database objects. All of the native SQL Server data types that have an equivalent in managed code can be used as parameters.

Specifies the result set supported as an output parameter. This parameter is dynamically constructed by the procedure and its contents may vary. Applies only to cursor parameters. This option is not valid for CLR procedures. A default value for a parameter. If a default value is defined for a parameter, the procedure can be executed without specifying a value for that parameter. The default value must be a constant or it can be NULL. The constant value can be in the form of a wildcard, making it possible to use the LIKE keyword when passing the parameter into the procedure.

Default values are recorded in the sys. Indicates that the parameter is an output parameter. An output parameter can be a cursor placeholder, unless the procedure is a CLR procedure. Indicates that the parameter cannot be updated or modified within the body of the procedure. Indicates that the Database Engine does not cache a query plan for this procedure, forcing it to be compiled each time it is executed.

For more information regarding the reasons for forcing a recompile, see Recompile a Stored Procedure. The output of the obfuscation is not directly visible in any of the catalog views in SQL Server. In this section, you will learn how you can check if a stored procedure parameter contains a null value or not. Thus, you might have learned how you can check if any stored procedure parameter contains a NULL value or not.

In this section, we will discuss the NULL value in the stored procedure parameters. You will learn how you can assign NULL values to a stored procedure parameter. Also, how you can use the NULL value as the default value in a stored procedure parameter. You can also use the NULL parameter as the default parameter.

In the next section below you can learn how you can use the default parameters to avoid the error if no value is passed to a stored procedure. Read SQL Server stored procedure if else. In this section, you will learn the usage and importance of the default parameters in SQL Server with the help of an example. We use default parameters in SQL Server to ensure that if no value is provided to the parameter then a default value is treated as the supplied value.

This helps to prevent the program from breaking in case if no value is supplied to the parameter. Also, if you want to give a default value to a column instead of a null value, you can use the default parameters. For example, you have created a stored procedure and defined some input parameters. Now if you are not supplying any value to the stored procedure parameter at the time of executing it, the SQL Server database engine will throw an error stating the expected input parameter.

To avoid such conditions, you can use a default parameter where you doubt that there may be a case when no value will be passed to the parameter. We have created an example below for demonstrating the use of default parameters.

There is no concept of passing an array as a parameter in SQL Server. However, you can achieve this functionality with the help of table-valued parameters. You can create a table-valued parameter and create a column for storing the values that you want to pass as an array.

Later, in the stored procedure, you can access those values from the table-valued parameter as you access from a table. For more information on table-valued parameters and how to create them, you can refer to the next section below.

In SQL Server stored procedures, you can also pass table data to the input parameters and perform various operations on it. You will learn in this section how you can pass the table data to the stored procedure input parameters. You will get to learn better with the help of an example.

Firstly, you have to create a user-defined table data type. Then create a variable of this user-defined data type, insert some values into the variable and pass it to the stored procedure as an input parameter. For example:. Thus, you might have learned how you can pass the table data as the input parameter to a stored procedure. If you created the stored procedure and you want to recreate the stored procedure with the same name, you can delete it using the following before trying to create it again.

We can also do the same thing, but allow the users to give us a starting point to search the data. In both of the proceeding examples it assumes that a parameter value will always be passed. If you try to execute the procedure without passing a parameter value you will get an error message such as the following:. In most cases it is always a good practice to pass in all parameter values, but sometimes it is not possible.

So in this example we use the NULL option to allow you to not pass in a parameter value. If we create and run this stored procedure as is it will not return any data, because it is looking for any City values that equal NULL. So if a value is passed it will use the value to narrow the result set and if a value is not passed it will return all records. Setting up multiple parameters is very easy to do. You just need to list each parameter and the data type separated by a comma as shown below.

It is a good idea to have the procedure return a customized message if the procedure is executed without a value for the parameter. NULL is assigned as the default value for the parameter and is used in error handling statements to return a custom error message for cases when the procedure is executed without a value for the SalesPerson parameter. The following example executes the procedure. The first statement executes the procedure without specifying an input value.

This causes the error handling statements in the procedure to return the custom error message. The second statement supplies an input value and returns the expected result set. Although parameters for which defaults have been supplied can be omitted, the list of parameters can only be truncated. For example, if a procedure has five parameters, both the fourth and the fifth parameters can be omitted. The direction of a parameter is either input, a value is passed into the body of the procedure, or output, the procedure returns a value to the calling program.

The default is an input parameter. The procedure returns the current value of the output parameter to the calling program when the procedure exits.