Question

我有这样的表

create table tbl_1(
  year int,
  month int, 
 day int
)

insert into tbl_1 values(2009,  11, 30)
insert into tbl_1 values(2010,   3,  4)
insert into tbl_1 values(2011,   5, 13)
insert into tbl_1 values(20011, 12, 24)

我想删除2009-11-30至2011-5-13的日期，但我不能，因为所有列都是int，我不能使用此查询：

delete from tbl_1 
 where year >=2009 
   and year<=2011 
   and month >=11 
   and month <=5 
   and day >=30 
   and day <=13

..因为：1＆lt;月份＆lt; 12和1＆lt;一天＆lt; 30

我知道这是一个可怕的错误。

我有很多表使用这种方式保存日期，请帮助我，我没有时间删除并重新创建所有这些。

Answer 1

你可以这样做：

DELETE FROM tbl_1 
WHERE (year * 10000 + month * 100 + day) BETWEEN 20091130 AND 20110513

我没有测试过这个。我建议先在测试系统上测试它，然后再在生产数据上运行，这样就不会意外删除错误的数据。

Answer 2

在MySQL和PostgreSQL：

DELETE
FROM    tbl_1
WHERE   (2009, 11, 30) <= (year, month, date)
        AND (year, month, date) <= (2011, 5, 13)

在PostgreSQL中你甚至可以这样做：

DELETE
FROM    tbl_1
WHERE   (year, month, date) BETWEEN (2009, 11, 30) AND (2011, 5, 13)

Answer 3

只需使用更多布尔运算符：

DELETE FROM tbl_1
WHERE (year = 2009 AND (month > 11 OR (month = 11 AND day >= 30)))
OR year = 2010
OR (year = 2011 AND (month < 5 OR (month = 5 AND day <= 13)))

不漂亮，但确实有效。

修改

参数化：

DELETE FROM tbl_1 WHERE (year = %minYear% AND (month > %minMonth% OR (month = %minMonth% AND day >= %minDay%))) OR (year > %minYear% AND year < %maxYear%) OR (year = %maxYear% AND (month < %maxMonth% OR (month = %maxMonth% AND day <= %maxDay%)))

Answer 4

在where子句中将列转换为日期：

DELETE tbl_1
WHERE CONVERT(DATETIME, CONVERT(VARCHAR(4), year) + '-' + convert(VARCHAR(2), month) + '-' + CONVERT(VARCHAR(2), day)) BETWEEN '20091130' AND '20110513'

Answer 5

最简单的方法是使用DATE_FORMAT。像这样：

...
WHERE DATE_FORMAT( CONCAT(year,"-",month,"-",day), '%Y-%m-%d' ) > "2009-11-30"
AND DATE_FORMAT( CONCAT(year,"-",month,"-",day), '%Y-%m-%d' ) < "2011-05-13"

希望这有帮助！： - ）

如何删除此表中的日期？

5 个答案: