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  SQL Server Tips by Gama and Naughter


SP with Input parameter, output in the message window

SP’s have input parameters that will allow data passed during the call and used internally. In this example, the SP has an input parameter “name” and the output is a salute plus the input. It is a variation of “Hello World!” and the twist is that it returns “Hello <name>!” where <name> is the input parameter data.

--SP with one input parameter, output in the message window
PRINT 'Hello '+@name+'!'

SP with Input parameter, output in the grid window

The output can also be a rowset as in one of the previous examples.

--SP with one input parameter, output in the grid window
select 'Hello '+@name+'!' AS [Hi]

SP with Input and Output parameters

The output of an SP could also be returned in an output parameter. This way a variable is used to store the output from the SP. This example is very simple: it changes the first character of the input to upper case and the rest to lower case.

--Capitalizes first char, changes the rest to lower case
--SP with one input parameter and one output parameter
SET @nameCap=UPPER(LEFT(@name,1))+LOWER(RIGHT(@name,LEN(@name)-1))

SP with a parameter that is both Input and Output

In some situations, there is no need to store the output into an extra variable because the output must replace the input.

--Capitalizes first char, changes the rest to lower case
--SP with one input/output parameter
SET @name=UPPER(LEFT(@name,1))+LOWER(RIGHT(@name,LEN(@name)-1))

SP with named parameters

The SP cap1 from the first example is fine for this example, as well. So far these examples called SP’s with the parameters specified by their location, that is, the position of the values to be passed to the SP defines which parameters will receive those values. It is very easy to call an SP with named parameters:

* The advantages of the order of the parameters becoming irrelevant are:
* Adding parameters to the SP without having to supply unnecessary ones when calling.
* Determining missing parameters for error handling or as optional parameters.
* Using default parameters without having to fill them with NULL’s.

The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter


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