在SQL中,可以使用EXTRACT函数来提取日期的不同部分,例如年份、月份、日期等。以下是一些示例: 提取年份: SELECT EXTRACT(YEAR FROM date_column) AS year FROM table_name; 复制代码 提取月份: SELECT EXTRACT(MONTH FROM date_column) AS month FROM table_name; 复制代码 提取日期: SELECT EXTRACT(DAY FROM...
SQL>SELECTEXTRACT(YEARFROMSYSDATE )FROMDUAL;--结果:2019SQL>SELECTEXTRACT(YEARFROMTO_DATE('2018-02-02 12:00:00','YYYY-MM-DD HH24:MI:SS'))FROMDUAL;--结果:2018 2.截取日期的 月份: --使用方法:EXTRACT(MONTHFROMDATE) SQL>SELECTEXTRACT(MONTHFROMTO_DATE('2018-02-02 12:00:00','YYYY-MM-...
SELECT EXTRACT(YEAR FROM SYSDATE) FROM DUAL;// return Current Year SELECT EXTRACT(MONTH FROM SYSDATE) FROM DUAL; //return Current Month SELECT EXTRACT(DAY FROM SYSDATE) FROM DUAL; //return Current Day SELECT EXTRACT(HOUR FROM SYSDATE) FROM DUAL;//Error SELECT EXTRACT(HOUR FROM TIM...
可以使用以下SQL语句实现: SELECT EXTRACT(YEAR FROM order_date) AS year, EXTRACT(MONTH FROM order_date) AS month, SUM(amount) AS total_amount FROM orders GROUP BY EXTRACT(YEAR FROM order_date), EXTRACT(MONTH FROM order_date) ORDER BY year, month; 复制代码 在上面的示例中,我们使用EXTRACT函数...
只可以从一个date类型中截取年月日 SQL>selectextract (yearfromsysdate)year,extract (monthfromsysdate)month,extract (dayfromsysdate)dayfromdual;YEARMONTHDAY--- --- ---201554 只可以从一个date类型中截取年月日 SQL>selectextract (yearfromdate'...
```sql SELECTEXTRACT(YEARFROM'2024-01-01'); ``` 结果为:2024 2.提取月份: ```sql SELECTEXTRACT(MONTHFROM'2024-01-01'); ``` 结果为:1 3.提取日期: ```sql SELECTEXTRACT(DAYFROM'2024-01-01'); ``` 结果为:1 4.提取小时: ```sql SELECTEXTRACT(HOURFROM'2024-01-0112:30:00'); ``...
SQL Datepart Function You can also use the datepart function to get the year from a date. This function feels closely similar to the extract function in Standard SQL. An example usage is as shown: SELECT DATEPART(YEAR, CURRENT_TIMESTAMP) as year; ...
下面是一个示例SQL语句: SELECTCONCAT(EXTRACT(YEARFROMdate_field),'-',EXTRACT(MONTHFROMdate_field),'-01')ASmonth_startFROMtable_name; 1. 2. 3. 4. 其中,date_field是日期字段的名称,table_name是表的名称。 3. 示例代码 假设有一个名为orders的表,其中包含了订单的日期信息。我们希望从订单表中提取...
sql SELECT EXTRACT(YEAR FROM OrderDate) AS OrderYear,EXTRACT(MONTH FROM OrderDate) AS OrderMonth,EXTRACT(DAY FROM OrderDate) AS OrderDay FROM Orders WHERE OrderId = 1 这个查询将返回如下结果：OrderYear | OrderMonth | OrderDay ---|---|--- 2008 | 11 | 11 由此可见，EXT...
SELECT EXTRACT(YEAR FROM order_date) AS year FROM orders; 如果我们想要获取每个订单发生的月份,可以使用以下查询: SELECT EXTRACT(MONTH FROM order_date) AS month FROM orders; 与其它函数结合使用 EXTRACT()函数也可以与其他 SQL 函数结合使用,以创建更复杂的查询,我们可以结合使用EXTRACT()和GROUP BY来统计...