我目前正在尝试编写一个查询，该查询将返回所有未在我们的时间表系统中记录给定日期时间的用户。我们目前有2个表，时间表和用户。我正在尝试进行一个查询，该查询将返回日期范围的时间表表中没有条目的用户列表。每天的时间表中只有一条记录，这应该很简单，但我无法弄清楚如何在我的生活中接近这一点。
任何帮助将不胜感激:)。
+-----------------------+------------------+------+-----+---------+----------------+ | 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 | | | 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 | | +--------------------------------+---------------+------+-----+---------+----------------+
此外，如果一天没有记录时间，则在时间表中没有创建记录。
答案 0 :(得分：3)
第一个查询获取@start和@end之间没有注册的所有用户：
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
此查询会提取所有缺少任何日期和缺少日期的用户（正如您在问题评论中所要求的那样）：
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
试验台：
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');
使用测试台从第二次查询输出：
'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'
如果需要，您还可以创建第二个查询作为视图，并按如下方式查询：
SELECT * FROM ViewMissingRegistrations
WHERE timesheetForDate BETWEEN @start AND @end
答案 1 :(得分：2)
SELECT * FROM Users U
WHERE U.UserNo NOT IN (
SELECT timesheetForUser FROM timesheets
WHERE timesheetForDate BETWEEN ??? AND ???
)
答案 2 :(得分：0)
你可以尝试
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