MySQL absentee report script

I'm currently trying to write a query that will return all users that have not logged time for a given date in our timesheet system. We currently have 2 tables, timesheets and users. I am trying to make a query that will return a list of users that do not have an entry in the timesheets table for a date range. There is only one record in the timesheets table per-day, this should be simple but I can't figure out how to approach this for the life of me.

Any help would be appreciated :).

+-----------------------+------------------+------+-----+---------+----------------+
| Field                 | Type             | Null | Key | Default | Extra          |
+-----------------------+------------------+------+-----+---------+----------------+
| timesheetID           | int(11) unsigned | NO   | PRI | NULL    | auto_increment |
| timesheetForUser      | int(11) unsigned | NO   |     |         |                |
| timesheetForDate      | date             | NO   |     |         |                |
| timesheetForCheckIn   | int(11)          | YES  |     | NULL    |                |
| timesheetNotes        | text             | YES  |     | NULL    |                |
| timesheetIsFilled     | tinyint(1)       | NO   |     |         |                |
| timesheetNoFillReason | int(11) unsigned | NO   |     |         |                |
| timesheetCreatedOn    | datetime         | NO   |     |         |                |
| timesheetCreatedBy    | int(11) unsigned | NO   |     |         |                |
| timesheetUpdatedOn    | datetime         | YES  |     | NULL    |                |
| timesheetUpdatedBy    | int(11) unsigned | YES  |     | NULL    |                |
+-----------------------+------------------+------+-----+---------+----------------+

+--------------------------------+---------------+------+-----+---------+----------------+
| Field                          | Type          | Null | Key | Default | Extra          |
+--------------------------------+---------------+------+-----+---------+----------------+
| userID                         | int(11)       | NO   | PRI | NULL    | auto_increment |
| userAccount                    | int(11)       | YES  |     | NULL    |                |
| userOrganization               | int(11)       | YES  |     | NULL    |                |
| userIsEmployee                 | tinyint(4)    | YES  |     | 0       |                |
| userEmployeeSince              | date          | YES  |     | NULL    |                |
| userName                       | varchar(255)  | YES  |     | NULL    |                |
| userTitle                      | varchar(255)  | YES  |     | NULL    |                |
| userEmail                      | varchar(255)  | YES  |     | NULL    |                |
| userLogin                      | varchar(50)   | YES  |     | NULL    |                |
| userPassword                   | varchar(255)  | YES  |     | NULL    |                |
| userSendInvitation             | tinyint(4)    | YES  |     | NULL    |                |
| userAddress1                   | varchar(255)  | YES  |     | NULL    |                |
| userAddress2                   | varchar(255)  | YES  |     | NULL    |                |
| userCity                       | varchar(255)  | YES  |     | NULL    |                |
| userCountry                    | char(2)       | YES  |     | NULL    |                |
| userState                      | varchar(6)    | YES  |     | NULL    |                |
| userStateOther                 | varchar(255)  | YES  |     | NULL    |                |
| userZip                        | varchar(20)   | YES  |     | NULL    |                |
| userPhone                      | varchar(50)   | YES  |     | NULL    |                |
| user_easypaycode               | varchar(6)    | YES  |     | NULL    |                |
| userFax                        | varchar(50)   | YES  |     | NULL    |                |
| userCell                       | varchar(50)   | YES  |     | NULL    |                |
| userTimezone                   | int(11)       | YES  |     | NULL    |                |
| userNotes                      | text          | YES  |     | NULL    |                |
| userActive                     | tinyint(4)    | NO   |     | 0       |                |
| userDisplayPictureType         | tinyint(4)    | YES  |     | NULL    |                |
| userDisplayPicture             | varchar(255)  | YES  |     | NULL    |                |
| userThumbnailPicture           | varchar(255)  | YES  |     | NULL    |                |
| userCanWriteMessages           | tinyint(4)    | NO   |     | 0       |                |
| userCanWriteComments           | tinyint(4)    | NO   |     | 0       |                |
| userCanUploadFiles             | tinyint(4)    | NO   |     | 0       |                |
| userCanCreateEvents            | tinyint(4)    | NO   |     | 0       |                |
| userCanCreateTickets           | tinyint(4)    | NO   |     | 0       |                |
| userCanManageProjects          | tinyint(4)    | NO   |     | 0       |                |
| userCanManageUsers             | tinyint(4)    | NO   |     | 0       |                |
| userCanManageOrganizations     | tinyint(4)    | NO   |     | 0       |                |
| userCanManageUserGroups        | tinyint(4)    | NO   |     | 0       |                |
| userCanManageMessageCategories | tinyint(4)    | NO   |     | 0       |                |
| userCanManageSetupOptions      | tinyint(4)    | NO   |     | 0       |                |
| userCanManageAllUsersItems     | tinyint(4)    | NO   |     | 0       |       开发者_JS百科         |
| userCanEnterTimesheets         | tinyint(4)    | NO   |     |         |                |
| userCanManageTimesheets        | tinyint(4)    | NO   |     |         |                |
| userCanUseTimeclock            | tinyint(4)    | YES  |     | NULL    |                |
| userCanOnlyUseTimeclock        | tinyint(4)    | YES  |     | NULL    |                |
| userLastLogin                  | datetime      | NO   |     |         |                |
| userPWResetText                | varchar(255)  | YES  |     | NULL    |                |
| userDeleted                    | tinyint(4)    | NO   |     | 0       |                |
| userDeletedBy                  | int(11)       | YES  |     | NULL    |                |
| userDeletedOn                  | datetime      | YES  |     | NULL    |                |
| userMinHoursPerDay             | decimal(10,1) | YES  |     | NULL    |                |
+--------------------------------+---------------+------+-----+---------+----------------+

In addition there is no record created in timesheets if there is no time logged for a day.

The first query fetches all the users that have no registrations between @start and @end:

SELECT users.userName
FROM users
LEFT JOIN timesheets
ON timesheets.timesheetForUser = users.userID
AND timesheets.timesheetForDate BETWEEN @start AND @end
WHERE timesheets.timesheetForUser IS NULL

This query fetches all users that are missing any days and which days they are missing (as you requested in an comment to your question):

SELECT dates.timesheetForDate, users.userName
FROM (SELECT DISTINCT timesheetForDate FROM timesheets) AS dates
CROSS JOIN users
LEFT JOIN timesheets
    ON timesheets.timesheetForUser = users.userID
    AND dates.timesheetForDate = timesheets.timesheetForDate
WHERE timesheets.timesheetForUser IS NULL

Test bed:

CREATE TABLE timesheets (timesheetForUser int, timesheetForDate datetime);
INSERT INTO timesheets (timesheetForUser, timesheetForDate) VALUES
(1, '2010-01-01'),
(2, '2010-01-01'),
(3, '2010-01-01'),
(1, '2010-01-02'),
(3, '2010-01-02'),
(2, '2010-01-03'),
(2, '2010-01-04'),
(3, '2010-01-04');

CREATE TABLE users (userId int, userName nvarchar(100));
INSERT INTO users (userId, userName) VALUES
(1, 'Foo'),
(2, 'Bar'),
(3, 'Baz');

Output from second query using test bed:

'2010-01-02 00:00:00', 'Bar'
'2010-01-03 00:00:00', 'Foo'
'2010-01-03 00:00:00', 'Baz'
'2010-01-04 00:00:00', 'Foo'

If you want you can also create the second query as a view and query it like this:

SELECT * FROM ViewMissingRegistrations
WHERE timesheetForDate BETWEEN @start AND @end

SELECT * FROM Users U
   WHERE U.UserNo NOT IN (
     SELECT timesheetForUser FROM timesheets 
       WHERE timesheetForDate BETWEEN ??? AND ???
   )

You could try

SELECT  u.*
FROM    Users u LEFT JOIN
        timesheets t ON u.userid = t.userid
WHERE   t.Date BETWEEN '01 Jan 2009' AND '31 Jan 2009'
AND     t.userID IS NULL