-A **SqlFilter** holds a SQL-like conditional expression that's evaluated in the broker against the arriving messages' user-defined properties and system properties. All system properties must be prefixed with `sys.` in the conditional expression. The [SQL-language subset for filter conditions](service-bus-messaging-sql-filter.md) tests for the existence of properties (`EXISTS`), null-values (`IS NULL`), logical `NOT`/`AND`/`OR`, relational operators, simple numeric arithmetic, and simple text pattern matching with `LIKE`.
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