MYSQL：如何獲得table1的具體數據和獲得對錶2和表3

表1的最新數據：tblemployeeMYSQL：如何獲得table1的具體數據和獲得對錶2和表3

+------------+----------+-----------+-------+-------+ 
| EmployeeID | LastName | FirstName | ID_SC | ID_ES | 
+------------+----------+-----------+-------+-------+ 
| 100000000 | Vallente | Rhea Mae | 7  | 2  | 
+------------+----------+-----------+-------+-------+ 
| 100000001 | Margallo | Matt  | 7  | 2  | 
+------------+----------+-----------+-------+-------+

表2：tblbadge

+---------+------------+--------------+--------+------+ 
| BadgeNo | EmployeeID | Deactivation | ID_Rem | ID_S | 
+---------+------------+--------------+--------+------+ 
| 1111111 | 100000001 | 2015-01-02 | 9  | 2 | 
+---------+------------+--------------+--------+------+ 
| 2222222 | 100000001 | 2014-01-02 | 9  | 2 | 
+---------+------------+--------------+--------+------+

表3 ：tblemployeeactivity

+------------+------------+---------------+-------+ 
| EmployeeID | ADate  | AttritionDate | ID_AT | 
+------------+------------+---------------+-------+ 
| 100000001 | 2015-01-01 | 2015-01-02 | 1  | 
+------------+------------+---------------+-------+ 
| 100000001 | 2014-01-01 | 2014-01-02 | 1  | 
+------------+------------+---------------+-------+

輸出計劃：

+------------+----------+-----------+-------+-------+---------+--------------+--------+------+------------+---------------+-------+ 
| EmployeeID | LastName | FirstName | ID_SC | ID_ES | BadgeNo | Deactivation | ID_Rem | ID_S | ADate  | AttritionDate | ID_AT | 
+------------+----------+-----------+-------+-------+---------+--------------+--------+------+-----------------------+----+-------+ 
| 100000001 | Margallo | Matt  | 7  | 2  | 1111111 | 2015-01-02 | 9  | 2 | 2015-01-01 | 2015-01-02 | 1  | 
+------------+----------+-----------+-------+-------+---------+--------------+--------+------+------------+---------------+-------+

問：如何在一個查詢最新的BadgeNo和AttritionDate假設tblemployee鏈接到tblemployeeactivity與tblemployee和tblbadge然而tblbadge和tblemployeeactivity不鏈接在一起也一樣在SQL中。

我得對tblemployee員工的全部細節，並獲取每個表（tblbadge & tblemployeeactivity）的最新數據，請參見輸出計劃，TIA。

PS。我也有過濾AttritionDate由Year和Month

來源

2016-02-11 Matt Magallo

'選擇一個*，b.BadgeNo，B。取消激活，b.ID_Rem，b.ID_S，c.ADate，c.AttritionDate，c.ID_AT FROM tblemployee a，（SELECT BadgeNo，Deactivation，ID_Rem，ID_S FROM tblbadge WHERE EmployeeID = a.EmployeeID ORDER BY Deactivation DESC LIMIT 1 ）b ，（SELECT ADate，AttritionDate，ID_AT FROM tblemployeeactivity WHERE EmployeeID = a.EmployeeID ORDER BY AttritionDate DESC LIMIT 1）c'可能不是最好的方法，但給一個鏡頭。 – Matt

SQLSTATE [42S22]：未找到列：1054'where子句'中的未知列'a.EmployeeID' 'a.EmpoyeeID'在where子句中未被識別 –

此查詢的工作產生期望的結果：

SELECT e.employeeid, e.lastname, e.firstname, e.id_sc, e.id_es, 
     q1.badgeno, q1.deact, q1.id_rem, q1.id_s, 
     q2.adate, q2.attritiondate, q2.id_at 
FROM tblemployee e 
INNER JOIN 
    (SELECT b.badgeno, b.employeeid, MAX(b.deactivation) AS deact, b.id_rem, b.id_s 
    FROM tblbadge b 
    GROUP BY b.employeeid) q1 
    ON q1.employeeid = e.employeeid 
INNER JOIN 
    (SELECT a.employeeid, MAX(a.adate) AS adate, a.attritiondate, a.id_at 
    FROM tblemployeeactivity a 
    GROUP BY a.employeeid) q2 
    ON e.employeeid = q2.employeeid

SQLFiddle：http://sqlfiddle.com/#!9/64a64a/17

來源

2016-02-11 06:45:16 Stidgeon

它的工作原理，它實際上保存我的a **，非常感謝你，我只是調整一些數據過濾的SQL。 –

MYSQL：如何獲得table1的具體數據和獲得對錶2和表3

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