YEAR_MONTH 得到的是年+月 只可以从一个date类型中截取年月日,从timestamp中获取年月日时分秒 select extract(MICROSECOND from timestamp '2021-08-25 08:54:09.549'), extract(SECOND from timestamp '2021-08-25 08:54:09.549'), extract(MINUTE from timestamp '2021-08-25 08:54:09.549'), extract...
CURRENT_TIMESTAMP:返回当前日期和时间。 sql SELECT CURRENT_TIMESTAMP; EXTRACT(field FROM source):从日期/时间值中提取指定的部分。其中,field 可以是 YEAR、MONTH、DAY、HOUR、MINUTE、SECOND 等。 sql SELECT EXTRACT(YEAR FROM TIMESTAMP '2023-07-19 10:30:00'); SELECT EXTRACT(MONTH FROM TIMESTAMP '...
YEAR_MONTH 得到的是年+月 返回时间日期特定部分 实例SQL select extract(MICROSECOND from timestamp '2021-08-25 08:54:09.549'), extract(SECOND from timestamp '2021-08-25 08:54:09.549'), extract(MINUTE from timestamp '2021-08-25 08:54:09.549'), extract(hour from timestamp '2021-08-25 ...
SELECT JSON_EXTRACT(content, '$.blog' ) AS '个人博客', JSON_EXTRACT(content, '$.content' ) AS '个人信息' FROM t_base_info 1. 2. 3. 4. 5. 6. 1.6.JSON完整内容 官方文档:https://dev.mysql.com/doc/refman/5.7/en/json-function-reference.html 官网上给的语句很多,我挑的是比较常用的...
select CURRENT_TIMESTAMP; 1. 4.EXTRACT(unit FROM date)——截取日期元素,截取出日期的一部分(年/月/日小时/秒等) SELECT CURRENT_TIMESTAMP, EXTRACT(YEAR FROM CURRENT_TIMESTAMP) AS year, EXTRACT(MONTH FROM CURRENT_TIMESTAMP) AS month,
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 TIMESTAMP '2005-10-10 10:10:10') FROM DUAL;// Correct SELECT ...
TIMESTAMP:包含日期和时间 TIMESTAMPTZ:包含日期、时间和时区 🌸 常用函数: SELECT NOW():获取当前日期和时间 SELECT TIMEOFDAY():获取当前时间 SELECT CURRENT_DATE:获取当前日期 SELECT CURRENT_TIME:获取当前时间 🌈 EXTRACT函数: EXTRACT(YEAR FROM date-col) AS pay_year:提取年份 EXTRACT(MONTH FROM date-...
三、EXTRACT 与TO_CHAR一样,EXTRACT可以提取时间字段中的年、月、日、时、分、秒。不同的是,EXTRACT的返回值为NUMBER类型。 createtabletestaasselectextract(yearfromsystimestamp)as"year",extract(monthfromsystimestamp)as"month",extract(dayfromsystimestamp)as"day",extract(hourfromsystimestamp)as"hour",ex...
SELECT CURRENT_TIME; 获取当前datatime select current_timestamp; 提取时间类型数据中的信息 SELECT CURRENT_TIMESTAMP as now, EXTRACT(YEAR FROM CURRENT_TIMESTAMP) AS year,--提取年 EXTRACT(MONTH FROM CURRENT_TIMESTAMP) AS month,--月 EXTRACT(DAY FROM CURRENT_TIMESTAMP) AS day,--日 EXTRACT(HOUR ...