docs:modify doc
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@ -292,11 +292,11 @@ CONCAT_WS(separator_expr, expr1, expr2 [, expr] ...)
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LENGTH(expr)
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```
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**Description**: The length in bytes of a string
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**Description**: The length in bytes
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**Return value type**: Bigint
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**Applicable data types**: VARCHAR and NCHAR fields or columns
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**Applicable data types**: VARCHAR and NCHAR and VARBINARY
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**Nested query**: It can be used in both the outer query and inner query in a nested query.
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@ -292,11 +292,11 @@ CONCAT_WS(separator_expr, expr1, expr2 [, expr] ...)
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LENGTH(expr)
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```
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**功能说明**:以字节计数的字符串长度。
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**功能说明**:以字节计数的长度。
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**返回结果类型**:BIGINT。
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**适用数据类型**:输入参数是 VARCHAR 类型或者 NCHAR 类型的字符串或者列。
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**适用数据类型**:VARCHAR, NCHAR, VARBINARY。
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**嵌套子查询支持**:适用于内层查询和外层查询。
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