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Now, assume the current row of the outer query is the row with NameId 123. Yes, rows match based on FirstName and LastName, but none of the matching rows have a NameId less than 106.
#Duplicate scanner control center 4 code#
When the code checks the first row in Table 1, which has NameId 106, the EXISTS check returns false because the inner query doesn't return any rows.
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Physical execution plans might be different from the following logical description of the query, but you can interpret this query in the following way: Correlated subqueries are a little bit like nested loops.
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This reasonably complex T-SQL query uses a correlated subquery. Listing 1 shows one solution that you might find helpful. You can usually solve a problem in several ways with T-SQL, and the problem of deleting duplicate records is no exception. I'd like to end up with a table that looks like this: ID I have a table containing a set of columns that are supposed to be unique but that have duplicate values, which Table 1 shows. Editor's Note: Send your SQL Server questions and comments to SQL Server MVP Brian Moran at
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