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💬Generate LLM translations (#1043)
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‎docs/cn/sql-reference/20-sql-functions/05-datetime-functions/_category_.json

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{
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"label": "Date & Time Functions"
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"label": "日期与时间函数"
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}

‎docs/cn/sql-reference/20-sql-functions/05-datetime-functions/addinterval.md

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---
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title: ADD TIME INTERVAL
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description: Add time interval function
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title: 添加时间间隔
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description: 添加时间间隔函数
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title_includes: add_years, add_quarters, add_months, add_days, add_hours, add_minutes, add_seconds
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---
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Add a time interval to a date or timestamp, return the result of date or timestamp type.
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向日期或时间戳添加时间间隔，返回日期或时间戳类型的结果。
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## Syntax
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## 语法
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```sql
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ADD_YEARS(<exp0>, <expr1>)
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ADD_QUARTERs(<exp0>, <expr1>)
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ADD_QUARTERS(<exp0>, <expr1>)
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ADD_MONTHS(<exp0>, <expr1>)
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ADD_DAYS(<exp0>, <expr1>)
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ADD_HOURS(<exp0>, <expr1>)
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ADD_MINUTES(<exp0>, <expr1>)
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ADD_SECONDS(<exp0>, <expr1>)
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```
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## Return Type
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## 返回类型
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`DATE`, `TIMESTAMP`, depends on the input.
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`DATE`, `TIMESTAMP`，取决于输入。
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## Examples
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## 示例
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```sql
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SELECT to_date(18875), add_years(to_date(18875), 2);
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├─────────────────────────┼─────────────────────────────────────────┤
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│ 2021-09-05 09:23:17 │ 2021-09-05 09:23:19 │
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└───────────────────────────────────────────────────────────────────┘
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```
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```

‎docs/cn/sql-reference/20-sql-functions/05-datetime-functions/current-timestamp.md

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title: CURRENT_TIMESTAMP
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---
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Alias for [NOW](now.md).
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[NOW](now.md) 的别名。

‎docs/cn/sql-reference/20-sql-functions/05-datetime-functions/date-add.md

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title: DATE_ADD
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---
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Add the time interval or date interval to the provided date or date with time (timestamp/datetime).
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将时间间隔或日期间隔添加到提供的日期或带时间的日期（时间戳/日期时间）。
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## Syntax
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## 语法
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```sql
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DATE_ADD(<unit>, <value>, <date_or_time_expr>)
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```
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## Arguments
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## 参数
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| Arguments | Description |
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| 参数 | 描述 |
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|-----------------------|-------------------------------------------------------------------------------------------------------------------|
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| `<unit>` | Must be of the following values: `YEAR`, `QUARTER`, `MONTH`, `DAY`, `HOUR`, `MINUTE` and `SECOND` |
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| `<value>` | This is the number of units of time that you want to add. For example, if you want to add 2 days, this will be 2. |
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| `<date_or_time_expr>` | A value of `DATE` or `TIMESTAMP` type |
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| `<unit>` | 必须是以下值之一：`YEAR`、`QUARTER`、`MONTH`、`DAY`、`HOUR`、`MINUTE` 和 `SECOND` |
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| `<value>` | 这是您要添加的时间单位数量。例如，如果您想添加2天，则此值为2。 |
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| `<date_or_time_expr>` | 一个 `DATE` 或 `TIMESTAMP` 类型的值 |
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## Return Type
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## 返回类型
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The function returns a value of the same type as the `<date_or_time_expr>` argument.
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函数返回与 `<date_or_time_expr>` 参数相同类型的值。
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## Examples
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## 示例
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Query:
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查询：
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```sql
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SELECT date_add(YEAR, 1, to_date('2018-01-02'));
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├──────────────────────────────────────────┤
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│ 2019-01-02 │
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└──────────────────────────────────────────┘
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```
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```

‎docs/cn/sql-reference/20-sql-functions/05-datetime-functions/date-diff.md

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title: DATE DIFF
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---
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Databend does not provide a `date_diff` function yet, but it supports direct arithmetic operations on dates and times. For example, you can use the expression `TO_DATE(NOW())-2` to obtain the date from two days ago.
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Databend 目前尚未提供 `date_diff` 函数，但它支持直接对日期和时间进行算术运算。例如，你可以使用表达式 `TO_DATE(NOW())-2` 来获取两天前的日期。
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This flexibility of directly manipulating dates and times in Databend makes it convenient and versatile for handling date and time computations. See an example below:
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Databend 直接操作日期和时间的灵活性使其在处理日期和时间计算时既方便又多功能。请参见以下示例：
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```sql
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CREATE TABLE tasks (
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│ Task 2 │ 7 │
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│ Task 3 │ 3 │
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└────────────────────────────────────┘
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```
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```

‎docs/cn/sql-reference/20-sql-functions/05-datetime-functions/date-format.md

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title: DATE_FORMAT
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---
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Alias for [TO_STRING](../02-conversion-functions/to-string.md).
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[TO_STRING](../02-conversion-functions/to-string.md) 的别名。

‎docs/cn/sql-reference/20-sql-functions/05-datetime-functions/date-part.md

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import FunctionDescription from '@site/src/components/FunctionDescription';
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<FunctionDescription description="Introduced or updated: v1.2.153"/>
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<FunctionDescription description="引入或更新：v1.2.153"/>
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Retrieves the designated portion of a date, time, or timestamp.
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提取日期、时间或时间戳的指定部分。
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See also: [EXTRACT](extract.md)
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另请参阅：[EXTRACT](extract.md)
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## Syntax
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## 语法
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```sql
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DATE_PART( YEAR | QUARTER | MONTH | WEEK | DAY | HOUR | MINUTE | SECOND | DOW | DOY, <date_or_time_expr> )
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```
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- DOW: Day of Week.
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- DOY: Day of Year.
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- DOW：星期几。
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- DOY：一年中的第几天。
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## Return Type
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## 返回类型
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Integer.
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整数。
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## Examples
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## 示例
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```sql
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SELECT NOW();

‎docs/cn/sql-reference/20-sql-functions/05-datetime-functions/date-sub.md

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title: DATE_SUB
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---
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Subtract the time interval or date interval from the provided date or date with time (timestamp/datetime).
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从提供的日期或日期时间（时间戳/日期时间）中减去时间间隔或日期间隔。
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## Syntax
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## 语法
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```sql
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DATE_SUB(<unit>, <value>, <date_or_time_expr>)
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```
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## Arguments
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## 参数
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| Arguments | Description |
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| 参数 | 描述 |
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|-----------------------|-------------------------------------------------------------------------------------------------------------------|
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| `<unit>` | Must be of the following values: `YEAR`, `QUARTER`, `MONTH`, `DAY`, `HOUR`, `MINUTE` and `SECOND` |
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| `<value>` | This is the number of units of time that you want to add. For example, if you want to add 2 days, this will be 2. |
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| `<date_or_time_expr>` | A value of `DATE` or `TIMESTAMP` type |
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| `<unit>` | 必须是以下值之一：`YEAR`, `QUARTER`, `MONTH`, `DAY`, `HOUR`, `MINUTE` 和 `SECOND` |
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| `<value>` | 这是您想要减去的时间单位数量。例如，如果您想减去2天，这就是2。 |
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| `<date_or_time_expr>` | 一个 `DATE` 或 `TIMESTAMP` 类型的值 |
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## Return Type
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## 返回类型
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The function returns a value of the same type as the `<date_or_time_expr>` argument.
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函数返回与 `<date_or_time_expr>` 参数相同类型的值。
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## Examples
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## 示例
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```sql
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SELECT date_sub(YEAR, 1, to_date('2018-01-02'));
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├──────────────────────────────────────────┤
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└──────────────────────────────────────────┘
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```
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```

‎docs/cn/sql-reference/20-sql-functions/05-datetime-functions/date-trunc.md

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title: DATE_TRUNC
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Truncates a date, time, or timestamp value to a specified precision. For example, if you truncate `2022-07-07` to `MONTH`, the result will be `2022-07-01`; if you truncate `2022-07-07 01:01:01.123456` to `SECOND`, the result will be `2022-07-07 01:01:01.000000`.
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将日期、时间或时间戳值截断到指定的精度。例如，如果将 `2022-07-07` 截断到 `MONTH`，结果将是 `2022-07-01`；如果将 `2022-07-07 01:01:01.123456` 截断到 `SECOND`，结果将是 `2022-07-07 01:01:01.000000`。
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## Syntax
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## 语法
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```sql
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DATE_TRUNC(<precision>, <date_or_time_expr>)
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```
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## Arguments
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## 参数
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| Arguments | Description |
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|-----------------------|----------------------------------------------------------------------------------------------------|
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| `<precision>` | Must be of the following values: `YEAR`, `QUARTER`, `MONTH`, `DAY`, `HOUR`, `MINUTE` and `SECOND` |
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| `<date_or_time_expr>` | A value of `DATE` or `TIMESTAMP` type |
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| 参数 | 描述 |
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|-----------------------|--------------------------------------------------------------------------------------------------|
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| `<precision>` | 必须是以下值之一：`YEAR`、`QUARTER`、`MONTH`、`DAY`、`HOUR`、`MINUTE` 和 `SECOND` |
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| `<date_or_time_expr>` | `DATE` 或 `TIMESTAMP` 类型的值 |
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## Return Type
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## 返回类型
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The function returns a value of the same type as the `<date_or_time_expr>` argument.
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函数返回与 `<date_or_time_expr>` 参数相同类型的值。
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## Examples
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## 示例
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```sql
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select date_trunc(month, to_date('2022-07-07'));
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```
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```

‎docs/cn/sql-reference/20-sql-functions/05-datetime-functions/date.md

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import FunctionDescription from '@site/src/components/FunctionDescription';
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<FunctionDescription description="Introduced or updated: v1.2.375"/>
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<FunctionDescription description="引入或更新：v1.2.375"/>
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Alias for [TO_DATE](to-date.md).
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[TO_DATE](to-date.md) 的别名。

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