为什么此查询返回2013年的项目？

Question

This query:

SELECT 
        mantis_bug_history_table.bug_id,
        mantis_category_table.name, 
        FROM_UNIXTIME(mantis_bug_table.date_submitted, "%m-%d-%Y"),
        FROM_UNIXTIME(mantis_bug_history_table.date_modified, "%m-%d-%Y"),
        ROUND((mantis_bug_history_table.date_modified- mantis_bug_table.date_submitted)/ 86400, 1) as day_difference
    FROM 
        (mantis_bug_table INNER JOIN mantis_bug_history_table ON mantis_bug_table.id = mantis_bug_history_table.bug_id) 
    INNER JOIN 
        mantis_category_table ON mantis_bug_table.category_id = mantis_category_table.id 
    WHERE
        FROM_UNIXTIME(mantis_bug_table.date_submitted, "%m-%d-%Y")
    BETWEEN '10/01/2014' AND '12/31/2014' 
    AND
        (((mantis_bug_history_table.field_name)="status") 
    AND 
        ((mantis_bug_history_table.new_value)="100")) 
    OR 
        (((mantis_bug_history_table.field_name)="new task")) 
    ORDER BY 
        mantis_bug_table.category_id, mantis_bug_table.date_submitted

Returns mostly valid data but also a couple of rows with these dates:

'39', 'Contracting', '12-12-2013', '01-14-2014', '32.7'
'40', 'Contracting', '12-12-2013', '01-14-2014', '32.7'
'41', 'Contracting', '12-19-2013', '03-12-2014', '82.9'
'42', 'Contracting', '12-31-2013', '01-14-2014', '13.9'

Can anyone explain why the between statement is not working 100%?

Answer 1

WHERE FROM_UNIXTIME(mantis_bug_table.date_submitted, "%m-%d-%Y")
      BETWEEN '10/01/2014' AND '12/31/2014' 

Look like rather different date formats to me.... one with - separator, the other with a / separator

Answer 2

To me, it looks like the OR part of your WHERE clause is going to bring in data you don't want. Let's reformat it.

WHERE 
    FROM_UNIXTIME(mantis_bug_table.date_submitted, "%m-%d-%Y") 
        BETWEEN '10/01/2014' AND '12/31/2014'
    AND (((mantis_bug_history_table.field_name)="status")
         AND ((mantis_bug_history_table.new_value)="100"))
    OR (((mantis_bug_history_table.field_name)="new task"))

It boils down to

WHERE 
    FROM_UNIXTIME ...
    AND ( ... AND ...)
    OR  ( ... )

Answer 3

IMHO there is too many transformations.

Try simple one:

WHERE
        mantis_bug_table.date_submitted
    BETWEEN '2014-10-01' AND '2014-12-31'