DF203: The NOT IN predicate with a subquery is used.
The topic describes the DF203 T-SQL code analysis rule.
Category
PERFORMANCE
Message
The NOT IN predicate with a subquery is used.
Description
Avoid using the NOT IN predicate in conjunction with a subquery. Use the NOT EXISTS predicate instead.
Noncompliant code example
SELECT c.CustomerName FROM dbo.Customer c
WHERE c.CustomerId NOT IN (SELECT r.CustomerId FROM dbo.Receipt r)
GO
Compliant solution
SELECT c.CustomerName FROM dbo.Customer c
WHERE NOT EXISTS (SELECT r.CustomerId FROM dbo.Receipt r WHERE r.CustomerId = c.CustomerId)
GO
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