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SQL statement: fix a typo #6897

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Aug 20, 2021
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SQL statement: fix a typo #6897

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SQL statement: fix a typo
en-jin19 Aug 19, 2021
6ca3c37
Update sql-statements/sql-statement-create-index.md
TomShawn Aug 20, 2021
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2 changes: 1 addition & 1 deletion sql-statements/sql-statement-create-index.md
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Expand Up @@ -201,7 +201,7 @@ DROP INDEX idx1 ON t1;
>
> 表达式索引将隐式占用名字，`_V$_{index_name}_{index_offset}`，如果已有相同名字的列存在，创建表达式索引将报错。如果后续新增相同名字的列，也会报错。
>
> 表达式中的表达式中出现函数参数的个数必须正确。
> 在表达式索引中，表达式的函数参数个数必须正确。

当查询语句中的表达式与表达式索引中的表达式一致时，优化器可以为该查询选择使用表达式索引。依赖于统计信息，某些情况下优化器不一定选择表达式索引。这时可以通过 hint 指定强制使用表达式索引。

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