'NOT GREATER THAN'条件Mysql

Question

I have a mysql table with columns userid and createdon where createdon column has DATE datatype.

---------------------------------------------------------------------------------
ID                      UserId                         CreatedOn
1                         65                           2013-06-13 
2                         54                           2013-07-03
3                         34                           2013-08-23
4                         65                           2013-09-13 
5                         89                           2013-09-13

Now I want the userids where last createdon was before 2013-09-08. The correct answer will be userids 54,34

Using

select userid from table  where createdon <'2013-09-08'

returns 65,54,34 and usind

select userid from table where userid notin (select userid from table where createdon > '2013-09-07')

takes a lot of time.

How to get the rows where last createdon < 2013-09-08

Answer 1

Try

SELECT UserID, MAX(CreatedOn) CreatedOn
  FROM table1
 GROUP BY UserId
HAVING CreatedOn < '2013-09-08'

Output:

| USERID |                     CREATEDON |
|--------|-------------------------------|
|     34 | August, 23 2013 00:00:00+0000 |
|     54 |   July, 03 2013 00:00:00+0000 |

Here is SQLFiddle demo

Answer 2

Your expectation is wrong. The first row of the table you posted would meet your criteria ( '2013-06-'13' < '2013-09-08' ). So a resultset with 65,54,34 is as expected.

Misunderstood the question.

What you want is:

    SELECT DISTINCT
       UserId
    FROM
       tbl outerTbl
    WHERE NOT EXISTS (
         SELECT *
         FROM tbl innerTbl
         WHERE
             outerTbl.UserId = innerTbl.UserId
             AND innerTbl.createdOn >= '2013-09-08'
    )

Answer 3

Try using STR_TO_DATE() function

SELECT userid FROM table  
WHERE createdon <= STR_TO_DATE('2013-09-08', '%Y-%m-%d')

Answer 4

Your query is correct, but probably you are not using proper data type for createdon column. Check that it works as expected in this SQLFiddle :

SELECT userid
FROM mytable
WHERE createdon < '2013-09-08'