在sql中拆分成多行

Question

我的表格似乎是 -

我希望实现这样的目标 -

请帮助SQL

Answer 1

使用apply：

select t.collegeid, t.deptid, t.empid, v.yr, v.mnth, v.act, v.pred
from t outer apply
     (values (act201701, pred201701, 2017, 1),
             (act201702, pred201702, 2017, 2),
             (act201703, pred201703, 2017, 3),
     ) v(act, pred, yr, mnth);

你也可以使用unpivot做同样的事情。但是，apply实现了横向连接，这比仅仅解开数据更强大。

Answer 2

如果列名是静态的，您可能可以使用UNION SELECT查询，如下所示：

Select CollegeID, DeptID, EmpID, "2017" As Y, "1" As Mnth, [Act201701] As Act, [Pred201701] As Pred from [SomeTable]
UNION
Select CollegeID, DeptID, EmpID, "2017" As Y, "2" As Mnth, [Act201702] As Act, [Pred201702] As Pred from [SomeTable]
UNION
Select CollegeID, DeptID, EmpID, "2017" As Y, "3" As Mnth, [Act201703] As Act, [Pred201703] As Pred from [SomeTable]

其中SomeTable是您的表名。

Answer 3

替换表名并尝试

insert into yourTableName (CollegeID, DeptID, EmpID, Yr, Mnth, Act, Pred) values (234, 34, 4, 2017, 1, 6131.86, 6131.82)