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Best Way To Do This
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Forum:
Microsoft SQL Server
Catégorie:
Autre
Divers
Thread ID:
01520112
Message ID:
01520141
Vues:
56
>>I have a table of voter info called Farmers with 92K rows in it. I also have a table of voters called tblCamp_CT with 9 million rows. I added a column to tblCamp_CT called 'IsFarmer' TINYINT.
>>
>>I now need to go through the Farmers table and for every row find the person in the tblCamp_CT using First Name, Last Name, Middle Name, and maybe some other info. If that person exists in the tblCamp_CT table, then set IsFarmer to 1.
>>
>>Wat's the best way to do something like this?
>
>
>WHILE (2 > 1)
>  BEGIN
>    BEGIN TRANSACTION
>    UPDATE TOP ( 10000 ) tblCamp_CT SET isFarmer = 1
>    FROM tblCamp
>    INNER JOIN Farmers ON ....
>    WHERE  tblCamp.isFarmer = 0
>    
>    IF @@ROWCOUNT = 0
>      BEGIN
>        COMMIT TRANSACTION
>        BREAK
>      END
>    COMMIT TRANSACTION
>  END -- WHILE
>
Boris,

It's a good idea to use a loop, but we need a different field to use, say, Processed. Otherwise you will be running an infinite loop, since not all people are farmers.
If it's not broken, fix it until it is.


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