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Merge pull request #21883 from taosdata/docs/TD-24855
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docs: fix document error for unique and sample
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dapan1121 committed Jun 28, 2023
2 parents 0eff07d + 1d1d35e commit f56499e
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12 changes: 4 additions & 8 deletions docs/en/12-taos-sql/10-function.md
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Expand Up @@ -998,18 +998,14 @@ SAMPLE(expr, k)

**Description**: _k_ sampling values of a specific column. The applicable range of _k_ is [1,1000].

**Return value type**: Same as the column being operated plus the associated timestamp
**Return value type**: Same as the column being operated

**Applicable data types**: Any data type except for tags of STable
**Applicable data types**: Any data type

**Applicable nested query**: Inner query and Outer query

**Applicable table types**: standard tables and supertables

**More explanations**:

- This function cannot be used in expression calculation.


### TAIL

Expand Down Expand Up @@ -1054,11 +1050,11 @@ TOP(expr, k)
UNIQUE(expr)
```

**Description**: The values that occur the first time in the specified column. The effect is similar to `distinct` keyword, but it can also be used to match tags or timestamp. The first occurrence of a timestamp or tag is used.
**Description**: The values that occur the first time in the specified column. The effect is similar to `distinct` keyword.

**Return value type**:Same as the data type of the column being operated upon

**Applicable column types**: Any data types except for timestamp
**Applicable column types**: Any data types

**Applicable table types**: table, STable

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12 changes: 4 additions & 8 deletions docs/zh/12-taos-sql/10-function.md
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Expand Up @@ -990,18 +990,14 @@ SAMPLE(expr, k)

**功能说明**: 获取数据的 k 个采样值。参数 k 的合法输入范围是 1≤ k ≤ 1000。

**返回结果类型**: 同原始数据类型, 返回结果中带有该行记录的时间戳
**返回结果类型**: 同原始数据类型。

**适用数据类型**在超级表查询中使用时,不能应用在标签之上
**适用数据类型**全部类型字段

**嵌套子查询支持**: 适用于内层查询和外层查询。

**适用于**:表和超级表。

**使用说明**

- 不能参与表达式计算;该函数可以应用在普通表和超级表上;


### TAIL

Expand Down Expand Up @@ -1046,11 +1042,11 @@ TOP(expr, k)
UNIQUE(expr)
```

**功能说明**返回该列的数值首次出现的值。该函数功能与 distinct 相似,但是可以匹配标签和时间戳信息。可以针对除时间列以外的字段进行查询,可以匹配标签和时间戳,其中的标签和时间戳是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。

**适用数据类型**适合于除时间类型以外的字段
**适用数据类型**全部类型字段

**适用于**: 表和超级表。

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