Question

表1：tblemployee

+------------+----------+-----------+-------+-------+
| 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     |
+------------+------------+---------------+-------+

输出计划：

+------------+----------+-----------+-------+-------+---------+--------------+--------+------+------------+---------------+-------+
| 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     |
+------------+----------+-----------+-------+-------+---------+--------------+--------+------+------------+---------------+-------+

问题：一个查询中最新的BadgeNo和AttritionDate如何假定tblemployee与tblemployeeactivity相关联，tblemployee和tblbadge相同{1}}但是tblbadge和tblemployeeactivity在SQL中没有链接在一起。

我必须在tblemployee上获取员工的完整详细信息并获取每个表格的最新数据（tblbadge＆amp; tblemployeeactivity），请参阅输出计划，TIA。

PS。另外，我必须按AttritionDate和Year
过滤Month

Answer 1

此查询可用于生成所需结果：

{{1}}

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

MYSQL：如何在table1上获取特定数据并获取table2和table3的最新数据

1 个答案: