Question

我有一个表格，字段为Id1，ID2，Points1，Points2。我有另一个包含Id1，Id2，Address1，address2，city 1，city2，state1列的表， state2。我必须根据第二个表中有多少列填充来更新pointsA和PointsB列，这意味着它们没有空值。实施例

表1

ID1  ID2   Points 1 Points2
1     2     2         0

表2

ID1  ID2 Address1 address2 city 1 city2 state1 state2.
1    2    a1       null     null   null  s1     null

如何在sql server 2008中实现这一目标？

由于

Answer 1

UPDATE t1
SET 
    Points1 = t2.Points1, 
    Points2 = t2.Points2
FROM
    Table1 t1 JOIN (
    SELECT
        ID1,
        ID2,
        CASE WHEN Address1 IS NULL THEN 0 ELSE 1 END +
        CASE WHEN City1 IS NULL THEN 0 ELSE 1 END +
        CASE WHEN State1 IS NULL THEN 0 ELSE 1 END AS Points1,
        CASE WHEN Address2 IS NULL THEN 0 ELSE 1 END +
        CASE WHEN City2 IS NULL THEN 0 ELSE 1 END +
        CASE WHEN State2 IS NULL THEN 0 ELSE 1 END AS Points2,
    FROM Table2
) t2 ON t1.ID1 = t2.ID1 AND t1.ID2 = t2.ID2

根据另一个表中的计数器更新列？

1 个答案: