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Variable in SQL Select Statement

Posted on 2014-10-13
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Last Modified: 2014-10-15
I am trying to show a list of teams and individuals. What I want to do is show a Person's Name that has been entered in a textbox when the Person's Name is null in the database. I do not want to use the Update Statement because it will only be temporary.  
string varPerson = Request.Form["PersonName"];
SELECT NumGames, PersonTeam, CASE WHEN PersonName IS NULL THEN varPerson END AS PersonName
FROM
(
Select NumGames, PersonTeam, PersonName FROM TeamData
)
TABLE1
Order by PersonTeam

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Question by:RecipeDan
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6 Comments
 
LVL 26

Expert Comment

by:Shaun Kline
ID: 40377546
Try using the ISNULL function:
ISNULL(PersonName, varPerson)
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Author Comment

by:RecipeDan
ID: 40377634
I tried this and nothing happens:
SELECT NumGames, PersonTeam, ISNULL(PersonName, varPerson) as PersonName
FROM
(
Select NumGames, PersonTeam, PersonName FROM TeamData
)
TABLE1
Order by PersonTeam

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Author Comment

by:RecipeDan
ID: 40377639
I get an invalid column name varPerson
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Accepted Solution

by:
Shaun Kline earned 2000 total points
ID: 40377663
Are you using a stored procedure for you SQL, or are you building your query in your .NET code?
If it is a stored procedure, you need to pass your .NET variable into it. If you are building the query in .NET, you need to "add" it to your query.

...PersonTeam, ISNULL(PersonName, '" + varPerson + "') as PersonName...

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Author Comment

by:RecipeDan
ID: 40378417
Thank you that works. Will Not Null be the same way?
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LVL 26

Expert Comment

by:Shaun Kline
ID: 40381957
When you use NOT NULL in a query, it is used for comparison. (Does this field have a value?) The ISNULL function uses the first parameter in the list that is not null. The CASE statement in your original query would have worked if you had included an ELSE condition. The ISNULL function is a little cleaner to use.
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