我有一个是连接到一个表的查询,我只希望基于DTM的限制左连接到最晚日期在查看
这是我的查询,看看最后输入的结果
CREATE OR REPLACE VIEW vwc_students AS
SELECT u_students.stud_id,u_students.stud_firstname, u_students.stud_middlename,u_students.stud_lastname, CONCAT_WS(' ',u_userse.user_firstname,u_userse.user_lastname) AS stud_editeduser, u_students.stud_edited, u_tbleeditlog.editedDtm
FROM u_students
JOIN u_studsites ON u_studsites.uss_studid = u_students.stud_id
JOIN u_locations ON u_locations.loc_id = u_students.stud_base
JOIN u_users ON u_users.user_id = u_students.stud_loggedid
LEFT JOIN (SELECT editedID, editedDtm FROM u_tbleeditlog WHERE editSite = 1 AND editType = 1 ORDER BY editedDtm DESC LIMIT 1) u_tbleeditlog ON u_tbleeditlog.editedID = u_students.stud_id
LEFT JOIN u_users AS u_userse ON u_userse.user_id = u_tbleeditlog.editedID
WHERE u_studsites.uss_siteid = '1'
但我得到的错误#1349 - View's SELECT contains a subquery in the FROM clause
我从Limiting a left join to returning one result?的代码示例和MySQL JOIN Multiple Tables With LIMIT Last Table By DateTime per result
谁能告诉米如果我想要做的事情是可能的,如果是的话,怎么样? :)
UPDATE
好吧,我现在有以下2条意见建议
CREATE OR REPLACE VIEW vwc_students AS
SELECT u_students.stud_id,u_students.stud_firstname, u_students.stud_middlename,u_students.stud_lastname, u_userse.editedEditor AS stud_editeduser, u_userse.editedDtm AS stud_edited
FROM u_students
JOIN u_studsites ON u_studsites.uss_studid = u_students.stud_id
JOIN u_locations ON u_locations.loc_id = u_students.stud_base
JOIN u_users ON u_users.user_id = u_students.stud_loggedid
LEFT JOIN vwu_editlog AS u_userse ON u_userse.editTypeID = u_students.stud_id AND u_userse.editType = 1
WHERE u_studsites.uss_siteid = '1'
和
CREATE OR REPLACE VIEW vwu_editlog AS
SELECT u_tbleeditlog.*, CONCAT_WS(' ',u_users.user_firstname,u_users.user_lastname) AS editedEditor
FROM u_tbleeditlog
JOIN u_users ON u_users.user_id = u_tbleeditlog.editedID
ORDER BY u_tbleeditlog.editedDtm DESC LIMIT 1
但最后这个观点限制了整个事情到1分的结果!我如何将每个唯一ID限制为1?我还得到消息Current selection does not contain a unique column. Grid edit, checkbox, Edit, Copy and Delete features are not available.
,即使在原表是有
为日期添加'ORDER BY'子句,然后将结果集限制在第一行。 – jpaugh 2014-08-27 23:57:10