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How can I delete the date in this table?

I have a table like this

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)

I want to remove the date from 2009-11-30 to 2011-5-13, but I cannot, because all the columns are int, and I cannot use this query:

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

.. because: 1 <month <12 and 1 <day <30

I know this is a terrible mistake.

I have many tables that use this method to save the date, please help me. I don’t have time to delete and recreate all of them.

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5 answers

You can do it as follows:

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

. , , .

+7

MySQL PostgreSQL:

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

PostgreSQL :

DELETE
FROM    tbl_1
WHERE   (year, month, date) BETWEEN (2009, 11, 30) AND (2011, 5, 13)
+4

:

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)))

, .

Edit:

:

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%)))
+3

where, :

DELETE tbl_1
WHERE CONVERT(DATETIME, CONVERT(VARCHAR(4), year) + '-' + convert(VARCHAR(2), month) + '-' + CONVERT(VARCHAR(2), day)) BETWEEN '20091130' AND '20110513'
0

- DATE_FORMAT. :

...
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"

, !: -)

0

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