!= or <>? Which T-SQL 'Not Equal' Syntax Should I Use?

T-SQL's "Not Equal" Operators: != vs. < >

Transact-SQL (T-SQL) offers two ways to express "not equal": != and <>. While both function similarly in many databases, the best practice hinges on database compatibility and ANSI SQL adherence.

Databases Accepting Both != and <>

Numerous popular database systems support both operators, offering flexibility to developers. This group includes:

• Microsoft SQL Server
• MySQL
• Oracle
• PostgreSQL
• IBM Informix

Databases Requiring the ANSI Standard <>

Some databases strictly enforce the ANSI SQL standard, designating <> as the only valid "not equal" operator. Examples include:

• IBM DB2
• Microsoft Access

Choosing the Right Operator

The optimal choice depends entirely on your target database system. Always refer to the database's official documentation to confirm the supported operators and best practices for your specific environment. Using <> ensures broader compatibility across different database platforms adhering to ANSI SQL standards.

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