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I have six tables in my SQL Server database.

Step 1: I UNION ALL Table 1, Table 2 and Table 3 into Datatable1.

Step 2: I UNION ALL Table 4, Table 5 and Table 6 into Datatable2.

In all the 6 tables the common columns are AlbumID,PictureID,StoryID.

Now I want to compare these columns in both the Datatables and put a flag (True) in Datatable1 where the data in both the datatables match else False.

I am thinking to use Linq or Lambda Expression to do the comparison. Is this the correct/best way to do this? OR should I go for TABLE JOINS?

Basically the table should have 4 columns :-

AlbumID, PictureID, StoryID, Flag
Flag would be true only if AlbumID or PictureID or StoryID is present in Datatable2
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1 solution

I guess it's a matter of opinion, but personally I would either join the tables or use an EXISTS[^] clause.

However, the first thing I would do is to stop to think the database design itself. If you have tables that have so many common columns, it raises the question if the database s normalized properly.

So without knowing anything more about the tables, I would advice you to have a closer look at the database design and consider if instead of having 6 tables which all have columns AlbumID,PictureID,StoryID could you simplify the design.
 
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