---
title: "MICROSECOND - OceanBase 数据库 V4.2.2 | OceanBase 文档中心"
description: "MICROSECOND 声明 MICROSECOND(expr) 说明 返回时间或日期时间表达式 expr 的微秒数。 示例 obclient> SELECT MICROSECOND('12:00:00.999999'); +--------------------------------+ | MICROSECON…"
---
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文档反馈![](https://mdn.alipayobjects.com/huamei_22khvb/afts/img/A*P8CuR4UJ_FkAAAAAAAAAAAAADiGDAQ/original) OceanBase 数据库分布式版 - V 4.2.2

# MICROSECOND

更新时间：2026-04-10 11:58:36

[编辑](https://github.com/oceanbase/oceanbase-doc/edit/V4.2.2/zh-CN/700.reference/500.sql-reference/100.sql-syntax/200.common-tenant-of-mysql-mode/400.functions-of-mysql-mode/200.single-row-functions-of-mysql-mode/100.date-and-time-functions-of-mysql-mode/2600.microsecond-of-mysql-mode.md)  

## 声明

```sql
MICROSECOND(expr)

```

## 说明

返回时间或日期时间表达式 `expr` 的微秒数。

## 示例

```sql
obclient> SELECT MICROSECOND('12:00:00.999999');
+--------------------------------+
| MICROSECOND('12:00:00.999999') |
+--------------------------------+
|                         999999 |
+--------------------------------+
1 row in set

obclient> SELECT MICROSECOND('2021-07-15 18:20:17.000010');
+-------------------------------------------+
| MICROSECOND('2021-07-15 18:20:17.000010') |
+-------------------------------------------+
|                                        10 |
+-------------------------------------------+
1 row in set

```

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