Adding records from two SQL Server tables that are unique on one column -

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I have two tables in a SQL Server database, which contain letters with a post and one of the documents sent electronically Is one. / [P> 

  Make Table [DBO]. [DocumentTransmission] ([PatentNumber] [varchar] (50) null, [filename] [varchar] (512) No tap, [infected datetime] [datetime2] (3) tap, [gpc] [Date] [50] Null, [status] [Wakahar] (50) Null, [email address] [Varchar] (64) NULL, [DateTimeAdded] [datetime2] (3) NULL) [Primary]

The other table is called DocumentPrint

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me DocumentTransmission And only need to select the record from DocumentPrint , where files Name appears in no DocumentTransmission - and I can not seem to know how to make DBA cry early because it is very slow - How do you suggest that it is done.

there is no adding a record to SQL However, you merge Two (or more) SELECT results can be combined with a UNION . Something like this: Choose from 

  * Select Document Transmission Union * From Document Print

Since you want to exclude rows from second condition , From which you need to add a condition: 

  from selection * Select the Document Coordination Union * Print with the document where the file name is not (choose filename from the document transmission)

But this query is not expected very fast: you Programming are very long than VARCHAR column and if many rows in the table if it is slow to be


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