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SQL NOT IN Operator Guide

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Basic Functionality: NOT IN replaces multiple <>/!= operators with AND in SQL queries
Compares one value to comma-separated list of potential matches
Only finds exact matches, ignoring duplicate values
Can be used anywhere other operators are used
Usage Rules: Cannot replace =, <, >, <=, >=, BETWEEN, or LIKE operators
Maximum list size is generally 5-10 items
Can use hard-coded or query-defined value lists
NOT keyword can be placed at start or in operator
Data Types: Works with string columns using quotes
Handles numeric values without quotes
Supports date/datetime comparisons with quotes
Performance Considerations: Not conducive to index seek operations
Should be used with indexes for better performance
Execution plan should be checked for optimal usage