我最近一直在学习MySQL和想知道如果有人可以帮助我解决这个问题我的工作..MySQL的高级加入
我有两个表,
首先是departmentTable
+------------+-----------+-----------+-----------+-----------+-----------+-----------+
| Department | Employee1 | Employee2 | Employee3 | Employee4 | Employee5 | Employee6 |
+------------+-----------+-----------+-----------+-----------+-----------+-----------+
| Finance | Tim C | Nora C | Susan P | Martin S | Donal D | Zita P |
| HR | Yvonne S | Marcus F | Mark B | Peter S | Ola G | Gina P |
| IT | John W | Matt R | Paul M | Tom Y | Jean S | Martin T |
+------------+-----------+-----------+-----------+-----------+-----------+-----------+
二是employeeDetails表
+--------------+-------+------------+--------+
| EmployeeName | Shift | Employment | Salary |
+--------------+-------+------------+--------+
| Donal D | Night | Full | 30000 |
| Gina P | Night | Part | 21000 |
| Jean S | Night | Full | 30000 |
| John W | Night | Full | 24000 |
| Marcus F | Night | Full | 21000 |
| Mark B | Day | Full | 23000 |
| Martin S | Day | Full | 23400 |
| Martin T | Day | Part | 31000 |
| Matt R | Day | Full | 22000 |
| Nora C | Day | Full | 22000 |
| Ola G | Night | Full | 21400 |
| Paul M | Day | Part | 23000 |
| Peter S | Day | Part | 25000 |
| Susan P | Day | Part | 23000 |
| Tim C | Day | Full | 24000 |
| Tom Y | Day | Full | 23400 |
| Yvonne S | Day | Full | 24000 |
| Zita P | Night | Part | 31000 |
+--------------+-------+------------+--------+
我试图找到一种方法如果有可能查询哪个部门有4天和2夜班员工。所以它应该输出是这样的..
+------------+-----------+-----------+-----------+-----------+-----------+-----------+
| Department | Employee1 | Employee2 | Employee3 | Employee4 | Employee5 | Employee6 |
+------------+-----------+-----------+-----------+-----------+-----------+-----------+
| Finance | Tim C | Nora C | Susan P | Martin S | Donal D | Zita P |
| IT | John W | Matt R | Paul M | Tom Y | Jean S | Martin T |
+------------+-----------+-----------+-----------+-----------+-----------+-----------+
任何帮助表示赞赏,我知道这是不是存储数据并获取他们最好的方式,但我想了解和学习更多关于MySQL的加入和计数。
修正你的表结构。将员工存储在一列中 – GurV
我正在介绍一些建议上述数据结构的培训材料。所以我只是试图了解它是否可能 – tom1123
请在写入预先查询之前先对数据库进行规范化。否则它会浪费你的时间和才华。 – Imran