sql中datetime日期类型字段比较(mysql&oracle)

mysql

可以直接用大于号，也可以用  between  and

SELECT * FROM users WHERE UPDATE_DATE >= '2021-08-12 11:22:09' AND UPDATE_DATE <= '2021-08-15 11:22:33';

SELECT * FROM users WHERE UPDATE_DATE BETWEEN '2021-08-12 11:22:09' AND '2021-08-15 11:22:33';

Oracle

oracle sql日期比较:

在今天之前:

select * from up_date where update < to_date('2021-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss')
select * from up_date where update <= to_date('2021-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss')

在今天只后:

select * from up_date where update > to_date('2022-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss')
select * from up_date where update >= to_date('2022-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss')

精确时间：

select * from up_date where update = to_date('2022-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss')

在某段时间内:

select * from up_date where update between to_date('2022-07-07 00:00:00','yyyy-mm-dd hh24:mi:ss') and to_date('2022-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss')
select * from up_date where update < to_date('2022-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss') and update > to_date('2022-07-07 00:00:00','yyyy-mm-dd hh24:mi:ss')
select * from up_date where update <= to_date('2022-09-07 00:00:00','yyyy-mm-dd hh24:mi:ss') and update >= to_date('2022-07-07 00:00:00','yyyy-mm-dd hh24:mi:ss')