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docs/en/sql-reference/statements/select/where.md
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@ -6,7 +6,7 @@ toc_title: WHERE
`WHERE` clause allows to filter the data that is coming from [FROM](../../../sql-reference/statements/select/from.md) clause of `SELECT`.
If there is a `WHERE` clause, it must contain an expression with the `UInt8` type. This is usually an expression with comparison and logical operators. Rows where this expression evaluates to 0 are expluded from further transformations or result.
If there is a `WHERE` clause, it must contain an expression with the `UInt8` type. This is usually an expression with comparison and logical operators. Rows where this expression evaluates to 0 are excluded from further transformations or result.
`WHERE` expression is evaluated on the ability to use indexes and partition pruning, if the underlying table engine supports that.