如何提取日期中年月 sql

在SQL中，提取日期中年份和月份的常用方法是使用日期和时间函数。以下是一些常见数据库系统中提取年份和月份的示例：

MySQL

```sql

SELECT YEAR(date_column) AS year, MONTH(date_column) AS month

FROM your_table;

```

PostgreSQL

```sql

SELECT EXTRACT(YEAR FROM date_column) AS year, EXTRACT(MONTH FROM date_column) AS month

FROM your_table;

```

SQL Server

```sql

SELECT YEAR(date_column) AS year, MONTH(date_column) AS month

FROM your_table;

```

Oracle

```sql

SELECT TO_CHAR(date_column, 'YYYY') AS year, TO_CHAR(date_column, 'MM') AS month

FROM your_table;

```

SQLite

```sql

SELECT strftime('%Y', date_column) AS year, strftime('%m', date_column) AS month

FROM your_table;

```

请将 `date_column` 替换为你的日期列的名称，`your_table` 替换为你的表名。这些函数会根据你的数据库系统自动提取出年份和月份。