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Update 10-function.md

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docs/zh/12-taos-sql/10-function.md
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@ -1042,7 +1042,7 @@ TOP(expr, k)
UNIQUE(expr) UNIQUE(expr)
``` ```
**功能说明**：返回该列数据首次出现的值。该函数功能与 distinct 相似，可以匹配标签和时间戳，对应数据第一次出现时刻的标签和时间戳。 **功能说明**：返回该列数据首次出现的值。该函数功能与 distinct 相似。
**返回数据类型**：同应用的字段。 **返回数据类型**：同应用的字段。