判断连号范围查询例子

xiaoer_1982

表Tb有两个长整型字段F1,F2

F1  F2
---------------------------
100 109
110 119
120 129
140 149
150 159
160 169


问题：
100 至 129 是连续的，140 至 169是连续的，如何得到

F1  F2
---------------------------
100 129
140 169
--> 生成测试数据表:tb

If not object_id('[tb]') is null
Drop table [tb]
Go
Create table [tb]([F1] int,[F2] int)
Insert [tb]
Select 100,109 union all
Select 110,119 union all
Select 120,129 union all
Select 140,149 union all
Select 150,159 union all
Select 160,169
Go
--Select * from [tb]

-->SQL2005查询如下:
select a.F1,b.F2
from
(
select rn=row_number()over(order by F1),F1 from tb t
where not exists(select 1 from tb where abs(F2-t.F1)=1)
) a
join
(
select rn=row_number()over(order by F2),F2 from tb t
where not exists(select 1 from tb where abs(t.F2-F1)=1)
) b
on a.rn=b.rn
/*
F1 F2
----------- -----------
100 129
140 169

(2 行受影响)
*/
-->SQL2000查询如下:
select a.F1,min(b.F2) F2
from
(
select F1 from tb t
where not exists(select 1 from tb where abs(F2-t.F1)=1)
) a
join
(
select F2 from tb t
where not exists(select 1 from tb where abs(t.F2-F1)=1)
) b
on a.F1<=b.F2
group by a.F1
/*
F1 F2
----------- -----------
100 129
140 169

(2 行受影响)
*/
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