Not Equal To (Transact SQL) - exclamation
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
SQL analytics endpoint in Microsoft Fabric
Warehouse in Microsoft Fabric
Tests whether one expression is not equal to another expression (a comparison operator). If either or both operands are NULL, NULL is returned. Functions the same as the <> (Not Equal To) comparison operator.