Sql 如何合并不同表中的范围
给出以下两个表格:Sql 如何合并不同表中的范围,sql,sql-server,tsql,Sql,Sql Server,Tsql,给出以下两个表格: T1 ------------------ From | To | Value ------------------ 10 | 20 | XXX 20 | 30 | YYY 30 | 40 | ZZZ T2 ------------------ From | To | Value ------------------ 10 | 15 | AAA 15 | 19 | BBB 19 | 39 | CCC 39 | 40 | DDD
T1
------------------
From | To | Value
------------------
10 | 20 | XXX
20 | 30 | YYY
30 | 40 | ZZZ
T2
------------------
From | To | Value
------------------
10 | 15 | AAA
15 | 19 | BBB
19 | 39 | CCC
39 | 40 | DDD
在SQLServer2008上使用T-SQL获得以下结果的最佳方法是什么
“从/到”范围是连续的,没有间隙,下一个“从”始终与上一个“到”具有相同的值
下面的查询查找最小范围,然后再次从表中提取值:
SELECT ranges.from, ranges.to, T1.Value, T2.Value
FROM (SELECT all_from.from, min(all_to.to) as to
FROM (SELECT T1.FROM
FROM T1
UNION
SELECT T2.FROM
FROM T2) all_from
JOIN (SELECT T1.TO
FROM T1
UNION
SELECT T2.FROM
FROM T2) all_to ON all_from.from < all_to.to
GROUP BY all_from.from) ranges
JOIN T1 ON ranges.from >= T1.from AND ranges.to <= T1.to
JOIN T2 ON ranges.from >= T2.from AND ranges.to <= T2.to
ORDER BY ranges.from
首先,我声明的数据与您发布的数据相似。如果我所做的任何假设是错误的,请纠正我。最好是在问题中发表你自己的声明,这样我们都在使用相同的数据
DECLARE @T1 TABLE (
[From] INT,
[To] INT,
[Value] CHAR(3)
);
INSERT INTO @T1 (
[From],
[To],
[Value]
)
VALUES
(10, 20, 'XXX'),
(20, 30, 'YYY'),
(30, 40, 'ZZZ');
DECLARE @T2 TABLE (
[From] INT,
[To] INT,
[Value] CHAR(3)
);
INSERT INTO @T2 (
[From],
[To],
[Value]
)
VALUES
(10, 15, 'AAA'),
(15, 19, 'BBB'),
(19, 39, 'CCC'),
(39, 40, 'DDD');
以下是我的select查询,用于生成您的预期结果:
SELECT
CASE
WHEN [@T1].[From] > [@T2].[From]
THEN [@T1].[From]
ELSE [@T2].[From]
END AS [From],
CASE
WHEN [@T1].[To] < [@T2].[To]
THEN [@T1].[To]
ELSE [@T2].[To]
END AS [To],
[@T1].[Value],
[@T2].[Value]
FROM @T1
INNER JOIN @T2 ON
(
[@T1].[From] <= [@T2].[From] AND
[@T1].[To] > [@T2].[From]
) OR
(
[@T2].[From] <= [@T1].[From] AND
[@T2].[To] > [@T1].[From]
);
谢谢你的回答,但我最后使用了CTE,我认为wgich更干净
DECLARE @T1 TABLE ([From] INT, [To] INT, [Value] CHAR(3));
DECLARE @T2 TABLE ([From] INT, [To] INT, [Value] CHAR(3));
INSERT INTO @T1 ( [From], [To], [Value]) VALUES (10, 20, 'XXX'), (20, 30, 'YYY'), (30, 40, 'ZZZ');
INSERT INTO @T2 ( [From], [To], [Value]) VALUES (10, 15, 'AAA'), (15, 19, 'BBB'), (19, 39, 'CCC'), (39, 40, 'DDD');
;with merged1 as
(
select
t1.[From] as from1,
t1.[to] as to1,
t1.Value as Value1,
t2.[From] as from2,
t2.[to] as to2,
t2.Value as Value2
from @t1 t1
inner join @T2 t2
on t1.[From] < t2.[To]
and t1.[To] >= t2.[From]
)
,merged2 as
(
select
case when from2>=from1 then from2 else from1 end as [From]
,case when to2<=to1 then to2 else to1 end as [To]
,value1
,value2
from merged1
)
select * from merged2
窃取@isme的数据设置,我写了以下内容:
;With EPs as (
select [From] as EP from @T1
union
select [To] from @T1
union
select [From] from @T2
union
select [To] from @T2
), OrderedEndpoints as (
select EP,ROW_NUMBER() OVER (ORDER BY EP) as rn from EPs
)
select
oe1.EP,
oe2.EP,
t1.Value,
t2.Value
from
OrderedEndpoints oe1
inner join
OrderedEndpoints oe2
on
oe1.rn = oe2.rn - 1
inner join
@T1 t1
on
oe1.EP < t1.[To] and
oe2.EP > t1.[From]
inner join
@T2 t2
on
oe1.EP < t2.[To] and
oe2.EP > t2.[From]
也就是说,您创建一个包含时段EPs的所有可能端点的集合,然后对这些端点进行排序,并为每个端点分配一个行号OrderedEPs
然后,最终的查询将每对相邻的行组合在一起,并连接回原始表,以查找每一行中哪些行与所选范围重叠。我无法编译此查询。您是如何设置测试数据的?使用我的数据设置,这仍然无法为我编译。在您的查询副本中,我将所有出现的T1替换为[@T1],将所有出现的T2替换为[@T2],并在执行时收到此语法错误:Msg 156,级别15,状态1,第34行关键字“from”附近的语法不正确。我删除了关于结果集不同的注释,因为它们是相同的。
;With EPs as (
select [From] as EP from @T1
union
select [To] from @T1
union
select [From] from @T2
union
select [To] from @T2
), OrderedEndpoints as (
select EP,ROW_NUMBER() OVER (ORDER BY EP) as rn from EPs
)
select
oe1.EP,
oe2.EP,
t1.Value,
t2.Value
from
OrderedEndpoints oe1
inner join
OrderedEndpoints oe2
on
oe1.rn = oe2.rn - 1
inner join
@T1 t1
on
oe1.EP < t1.[To] and
oe2.EP > t1.[From]
inner join
@T2 t2
on
oe1.EP < t2.[To] and
oe2.EP > t2.[From]