SQL 面试题之头疼篇
收集一下最近的SQL 面试题和各位一同分享讨论，如果大家有更好的思路请拍板：
题目一：
建表脚本
if exists (select * from sysobjects where id = OBJECT_ID('[proceInfo]') and OBJECTPROPERTY(id, 'IsUserTable') = 1)
DROP TABLE [proceInfo]
CREATE TABLE [proceInfo] (
[ID] [int] NOT NULL primary key,
[pName] [varchar] (50) NOT NULL,
[pClick] [int] NOT NULL,
[parentID] [int] NOT NULL)
INSERT [proceInfo] ([ID],[pName],[pClick],[parentID]) VALUES ( 1,'男士裤子',200,2)
INSERT [proceInfo] ([ID],[pName],[pClick],[parentID]) VALUES ( 2,'女士裤子',250,2)
INSERT [proceInfo] ([ID],[pName],[pClick],[parentID]) VALUES ( 3,'男士帽子',100,3)
INSERT [proceInfo] ([ID],[pName],[pClick],[parentID]) VALUES ( 4,'女士帽子',90,3)
INSERT [proceInfo] ([ID],[pName],[pClick],[parentID]) VALUES ( 5,'男士鞋子',350,4)
INSERT [proceInfo] ([ID],[pName],[pClick],[parentID]) VALUES ( 6,'女士鞋子',250,4)
我的答案：
select * from proceInfo where ID in(
select Min(ID) from
(
select * from proceInfo where pClick in(select MAX(pclick) from proceInfo group by parentID)
)a group by parentID
)
题目二
建表脚本
if exists (select * from sysobjects where id = OBJECT_ID('[Stu_Tea]') and OBJECTPROPERTY(id, 'IsUserTable') = 1)
DROP TABLE [Stu_Tea]
CREATE TABLE [Stu_Tea] (
[sid] [int] NOT NULL,
[stuid] [int] NOT NULL,
[tid] [int] NOT NULL)
INSERT [Stu_Tea] ([sid],[stuid],[tid]) VALUES ( 1,1,2)
INSERT [Stu_Tea] ([sid],[stuid],[tid]) VALUES ( 2,2,2)
INSERT [Stu_Tea] ([sid],[stuid],[tid]) VALUES ( 3,3,2)
INSERT [Stu_Tea] ([sid],[stuid],[tid]) VALUES ( 4,4,2)
INSERT [Stu_Tea] ([sid],[stuid],[tid]) VALUES ( 5,1,3)
INSERT [Stu_Tea] ([sid],[stuid],[tid]) VALUES ( 6,1,4)
INSERT [Stu_Tea] ([sid],[stuid],[tid]) VALUES ( 7,2,4)
我的答案：
select distinct(stuid) from dbo.Stu_Tea where tid in(
(select top(1) tid from(
select COUNT(tid) c,tid from Stu_Tea group by tid)a
order by C desc),
(select top(1) tid from(
select COUNT(tid) c,tid from Stu_Tea group by tid)a
order by C asc))