5、子查询

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1、求一个聚合的SQL该怎么写

有这样的数据
员工开始日期终了日期
A 2013-05-01 00:00:00.000 2013-06-08 00:00:00.000
A 2013-09-02 00:00:00.000 2013-12-31 00:00:00.000
A 2013-09-05 00:00:00.000 NULL

求员工A的所能表示的最大范围的日期，取日期的并集，最后结果应该如下:
员工开始日期终了日期
A 2013-05-01 00:00:00.000 2013-06-08 00:00:00.000
A 2013-09-02 00:00:00.000 NULL

解法:

;with t(员工 , 开始日期,终了日期)as(select 'A', '2013-05-01 00:00:00.000','2013-06-08 00:00:00.000'union all select 'A','2013-09-02 00:00:00.000','2013-12-31 00:00:00.000'union all select 'A','2013-09-05 00:00:00.000',NULLunion all select 'A','2013-09-15 00:00:00.000','2013-11-08 00:00:00.000'),ttas(select 员工,开始日期,终了日期,       (select MIN(t2.开始日期)        from t t2        where t1.员工 = t2.员工              and t1.开始日期 between t2.开始日期 and isnull(t2.终了日期,'3000-01-01')       ) as min_开始日期,              (select max(isnull(t2.终了日期,'3000-01-01'))        from t t2        where t1.员工 = t2.员工              and t1.开始日期 between t2.开始日期 and isnull(t2.终了日期,'3000-01-01')       ) as max_终了日期    from t t1)select 员工,min_开始日期 as 开始日期,       nullif(max(max_终了日期),'3000-01-01') as  终了日期from ttgroup by 员工,min_开始日期/*员工 开始日期                 终了日期A 2013-05-01 00:00:00.0002013-06-08 00:00:00.000A 2013-09-02 00:00:00.000NULL*/

2、sql中怎么判断某个字段的值是否连续？

比如：A表的字段AID的值为：1、2、4、5、7、8、10
怎么用sql查询出2、5、8的结果呢？
要查的结果就是查询这组数据从哪里开始不连续的。

解法：

create table A(AID int) insert into A(AID) select 1 union all select 2 union all select 4 union all select 5 union all select 7 union all select 8 union all select 10select aidfrom(select a.aid,       (select min(aid) from a aa where aa.aid > a.aid) min_aidfrom A )awhere aid +1 < min_aid/*aid258*/

3、有个表有入库时间，有出库时间，想得到该样式号每月的销售和历史库存

库结构大概是这样：
货号样式号入库时间出库时间
a001 10 2011-1-10
b002 10 2011-1-10 2011-2-1
c003 10 2012-1-15 2012-2-2
d004 10 2013-2-3 2013-1-5
e005 10 2013-2-3
f006 15 2011-2-15 2011-3-16
g007 15 2011-2-16 2012-3-16
h009 15 2013-1-10
m012 18 2011-1-4
c009 18 2011-4-5 2012-5-6
f008 18 2012-2-19 2013-1-1
e008 18 2013-1-5 2013-2-6

想得到的结果：
样式号日期销售件数库存件数
10 2011-2 1 1
10 2012-2 1 1
10 2013-1 1 2
15 2011-3 1 0
15 2012-3 1 1
18 2012-5 1 1
18 2013-1 1 1
18 2013-2 1 1

解法：

if object_id('tb') is not null   drop table tbgo create table tb ([货号] varchar(20),[样式号] int,[入库时间] datetime,[出库时间] datetime) insert into tbSELECT 'a001',10,'2011-01-10',null UNION ALLSELECT 'b002',10,'2011-01-10','2011-02-01' UNION ALLSELECT 'c003',10,'2012-01-15','2012-02-02' UNION ALLSELECT 'd004',10,'2013-01-03','2013-01-05' UNION ALLSELECT 'e005',10,'2013-01-03',null UNION ALLSELECT 'f006',15,'2011-02-15','2011-03-16' UNION ALLSELECT 'g007',15,'2011-02-16','2012-03-16' UNION ALLSELECT 'h009',15,'2013-01-10',null UNION ALLSELECT 'm012',18,'2011-01-04',null UNION ALLSELECT 'c009',18,'2011-04-05','2012-05-06' UNION ALLSELECT 'f008',18,'2012-02-19','2013-01-01' UNION ALLSELECT 'e008',18,'2013-01-05','2013-02-06'go;with tas(select *,       row_number() over(partition by 样式号                              order by 入库时间,出库时间) as rownumfrom tb),ttas(select *,       case when 出库时间 is null                  then (select top 1 出库时间                        from t t2                        where t1.样式号 = t2.样式号 and                             t1.rownum > t2.rownum                       order by t2.rownum desc)            else 出库时间       end as prior_row,              case when 出库时间 is null                  then (select top 1 出库时间                        from t t2                        where t1.样式号 = t2.样式号 and                             t1.rownum < t2.rownum                       order by t2.rownum )            else 出库时间       end as next_row       from t t1),tttas(select 样式号,       convert(varchar(7),isnull(next_row,prior_row),120) as 日期,       count(出库时间) 销售件数,       count(入库时间) 库存件数,       count(入库时间) - count(出库时间) 剩余库存       --row_number() over(partition by 样式号        --order by convert(varchar(7),isnull(next_row,prior_row),120)) as rownumfrom ttgroup by 样式号,         convert(varchar(7),isnull(next_row,prior_row),120))select t1.样式号,t1.日期,       isnull(t1.销售件数,0) as 销售件数 ,              isnull(t1.库存件数,0) +        isnull((select  sum(库存件数)-sum(销售件数) as 剩余库存 from ttt t2                where t2.样式号 = t1.样式号                     and t2.日期 < t1.日期               ),0) -       isnull(t1.销售件数,0) as 库存件数       from ttt t1order by t1.样式号 /*样式号日期    销售件数库存件数10    2011-021    110    2012-021    110    2013-011    215    2011-031    015    2012-031    118    2012-051    118    2013-011    118    2013-021    1*/

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