更新时间:2023-02-05 20:39:16
交叉应用基本上是为此目的构建的
Cross apply was basically built for this
SELECT D.deptid, D.deptname, D.deptmgrid
,ST.empid, ST.empname, ST.mgrid
FROM Departments AS D
CROSS APPLY fn_getsubtree(D.deptmgrid) AS ST;
UPDATE some_table
SET some_row = another_row,
some_row2 = another_row/2
FROM some_table st
CROSS APPLY
(SELECT TOP 1 another_row FROM another_table at WHERE at.shared_id=st.shared_id)
WHERE ...