我有一个 #tmp 表,我需要从左表和右表中查找具有匹配名称和覆盖范围的所有记录。
-- select * from #tmp
--#tmp table
ID Name IsConverted Coverage EarliestPolicyEffectiveDate
1 abc 1 Test1 9/1/2017
2 abc 0 Test1 9/2/2017
3 abc 0 Auto 9/3/2017
4 xyz 0 Home 9/3/2017
-- select * from #tmp where IsConverted = 0
--LEFT TABLE
ID Name IsConverted Coverage
2 abc 0 Test1
3 abc 0 Auto
4 xyz 0 Home
-- select * from #tmp where IsConverted = 1
--RIGHT TABLE
ID Name IsConverted Coverage
1 abc 1 Test1
-- DESIRED RESULTS
ID Name IsConverted Coverage
1 abc 1 Test1
2 abc 0 Test1
-- CURRENT RESULTS
ID Name IsConverted Coverage
2 abc 0 Test1
select *
from
(SELECT * FROM #tmp tmp WHERE tmp.IsConverted = 0) nc
join
(SELECT * FROM #tmp tmp WHERE tmp.IsConverted = 1) ic on ic.Name = nc.Name and ic.Coverage = nc.Coverage
我需要能够从左右两个表中获取匹配的记录。这样做的原因非常复杂,没有为这篇文章添加任何其他信息。
我已经尝试了完全外部连接,交叉应用,外部应用。没有任何效果。
编辑:
最好我想使用 JOIN,因为一旦找到匹配的结果,我仍然需要访问左表和右表,因为我需要确保 LEFT。最早保单生效日期在权利后 15 天内。最早保单生效日期 .
我不确定如果我做 UNION ALL 我能做到这一点。
如下例所示:
select *
from
(SELECT * FROM #tmp tmp WHERE tmp.IsConverted = 0) nc
join
(SELECT * FROM #tmp tmp WHERE tmp.IsConverted = 1) ic on ic.Name = nc.Name and ic.Coverage = nc.Coverage
where
nc.EarliestPolicyEffectiveDate between DATEADD(d, -15, ic.EarliestPolicyEffectiveDate) and DATEADD(d, 15, ic.EarliestPolicyEffectiveDate)
有更好的方法可以做到这一点,但UNION ALL
和EXISTS
似乎在这里有效:
SELECT *
FROM #tmp t
WHERE IsConverted = 1
AND EXISTS(SELECT 1 FROM #tmp
WHERE IsConverted = 0
AND Name = t.Name
AND Coverage = t.Coverage)
UNION ALL
SELECT *
FROM #tmp t
WHERE IsConverted = 0
AND EXISTS(SELECT 1 FROM #tmp
WHERE IsConverted = 1
AND Name = t.Name
AND Coverage = t.Coverage);
名称。 和一个子查询,以获取 LEFT 和 RIGHT 之间的所有匹配覆盖率。 然后使用"AND"在WHERE
子句中将它们链接在一起
select * from #tmp
where name in (Select LEF.Name from LEF
INNER JOIN RIG ON LEF.NAME = RIG.NAME)
and coverage in (Select LEF.coverage from LEF
INNER JOIN RIG ON LEF.coverage = RIG.coverage)
结果:
ID NAME IsConverted Coverage EarliestPolicyEffectiveDate
----------- ---------- ----------- ---------- ---------------------------
1 abc 1 Test1 2017-09-01
2 abc 0 Test1 2017-09-02
我想我现在看到您正在尝试将左表直接连接到右表,而不是使用 #tmp 作为中间连接。
您需要将两者相交的地方联合起来。
伪代码:
SELECT * FROM LEFT TABLE WHERE EXISTS(matching row in RIGHT TABLE)
UNION
SELECT * FROM RIGHT TABLE WHERE EXISTS(matching row in LEFT TABLE)