Question

我有一张这样的表

InsuredID   | EmployeeNumber    | MemberTypeID  | LinkedMemberID
----------------------------------------------------------------
1001012     | 39018             | 102           | 0
1001061     | 39018             | 100           | 0
1001147     | 39019             | 102           | 0
1001196     | 39019             | 100           | 0

我需要将此表中的LinkedMemberID更新为具有相同InsuredID和EmployeeNumber的{{1}}的值，以用于所有不是100的成员类型。

MemberTypeID = 100的{p> LinkedMemberID将保持为0。

更新后，表格看起来应该是

MemberTypeID = 100

我尝试了各种SQLupdate语句，但无法弄清楚如何执行此操作。我正在使用SQL Server 2008.请帮助。

Answer 1

您可以使用APPLY功能：

SELECT
    t.InsuredID,
    EmployeeNumber,
    MemberTypeID,
    LinkedMemberID = CASE WHEN t.MemberTypeID = 100 THEN LinkedMemberID ELSE x.InsuredID END
FROM tbl t
OUTER APPLY (
    SELECT InsuredID
    FROM tbl
    WHERE EmployeeNumber = t.EmployeeNumber
    AND MemberTypeID = 100
)x

SQL Fiddle

将其转换为UPDATE语句：

UPDATE t
    SET t.LinkedMemberID = x.InsuredID
FROM tbl t
OUTER APPLY (
    SELECT TOP 1 InsuredID
    FROM tbl
    WHERE EmployeeNumber = t.EmployeeNumber
    AND MemberTypeID = 100
    ORDER BY InsuredID DESC
)x
WHERE t.MemberTypeID <> 100

SQL Fiddle

Answer 2

如果我理解正确，您需要update声明，并且可以使用join执行您想要的操作：

update toupdate
    set LinkedMemberID = t.InsuredID
    from table toupdate join
         table t
         on toupdate.EmployeeNumber = t.EmployeeNumber and
            t.MemberTypeID = 100
    where toupdate.MemberTypeID <> 100;

Answer 3

你可以试试这个：

UPDATE Your_Table
SET LinkedMemberID = (SELECT TOP 1 T.InsuredID
                      FROM Your_Table T
                      WHERE T.EmployeeNumber = Your_Table.EmployeeNumber
                         AND T.MemberTypeID  = 100)
WHERE MemberTypeID <> 100

根据同一个表中列中的相同值更新表

3 个答案: