Predicates
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
A predicate is an expression that evaluates to TRUE, FALSE, or UNKNOWN. Predicates are used in the search condition of WHERE clauses and HAVING clauses, the join conditions of FROM clauses, and other constructs where a Boolean value is required.
For more information, including how to specify a search condition, see Search condition.
SQL Server provides the following predicates:
- CONTAINS (Transact-SQL)
- FREETEXT (Transact-SQL)
- IS [NOT] DISTINCT FROM (Transact-SQL)
- IS NULL (Transact-SQL)