Working with Subqueries in SQL Server 2008 Best Practices
14 Nov 2010
SQL
When working with subqueries and common table expressions, you should consider the following best practices:
- Use subqueries to break down complex queries
- Consider the performance of subqueries, compared to other methods for retrieving data
- Use correlated subqueries against small result sets
- Use table aliases in correlated subqueries to prevent ambiguous column names
- Use the EXISTS operator to restrict the rows that a subquery will work against
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