Searching A Column For A Value To Avoid Inserting A Duplicate Value

Jul 17, 2007

Hi there, newbie here.

I'm building a web application that allows for tagging of items, using ASP.NET 2.0, C# and SQL Server.

I have my USERS, ITEMS and TAGS separated out into three tables, with an intersection table to connect them.

Imagine a user has found an item they are interested in and is about to tag it. They type their tag into a textbox and hit Enter.

Here's what I want to do:

I want to search the TagText column in my TAGS table, to see if the chosen tag is already in the table. If it is, the existing entry will be used in the new relationship the user is creating. Thus I avoid inserting a duplicate value in this column and save space. If the value is not already in the column, a new entry will be created.

Here's where I'm up to:

I can type a tag into a textbox and then feed it to a query, which returns any matches to a GridView control.

Now I'm stuck... I imagine I have to use "if else" scenario, but I'm unsure of the code I'll have to use. I also think that maybe ADO.NET could help me here, but I have not yet delved into this. Can anyone give me a few pointers to help me along?

 Cheers!

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Mar 2, 2007

Hello,

I have the following query,

SELECT GroupInfo.GroupID, GroupInfo.GroupName
FROM GroupInfo INNER Join DeviceGroup ON(DeviceGroup.GroupID=Groupinfo.GroupID)
INNER Join Deviceinfo ON (Deviceinfo.SerialNumber=DeviceGroup.SerialNumber )

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0 Abc
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0 Abc
0 Abc
0 Abc
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2 Alpha

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Hi all,
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John


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Rowid1


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1


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2


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3


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1


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3 Table1




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UK


 

JAPAN


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UK


Jack

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JAPAN
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[Code] ....

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Code Block
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[NXX] [smallint] NOT NULL DEFAULT ((0)),
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2 2 0

I've tried various queries the closest being:

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but it only shows one column and one site I'm not sure how to get the '4 Digit Count' column to show up and the rest of the sites. below are the results I get so far.

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------- -------------
1 2

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Thanks
Mike

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