ylbtech-SQL Server: SQL Server-表的高级查询-多表连接和子查询 |
SQL Server 表的高级查询-多表连接和子查询。
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--================================ -- ylb:表的高级查询- 多表连接和子查询 -- pubs库的练习 -- 17:18 2011/12/13 --================================ use pubs go select * from authors select * from titles --select * from titleauthor select * from publishers --1,查看出版社名称,书名称 go --2,查看出版社名称,出版社出书预付款总额 select pub_name,SUM(advance) '预付款总额' from publishers p inner join titles t on p.pub_id=t.pub_id group by pub_name go --3,查看出版社名称,出版社出书预付款最大值,单价最小值 select pub_name,max(advance) '付款最大值',MIN(price) '单价最小值' from publishers p inner join titles t on p.pub_id=t.pub_id group by pub_name go --4,查看出版社编号,出版社名称,书名称,书单价,作者编号 select * from publishers p inner join titles t on p.pub_id=t.pub_id inner join titleauthor ta on t.title_id=ta.title_id go --5,查看出版社编号,书总价,书最高价格,作者总数 ---5分析 --这本书(TC7777)有两个作者(472-27-2349,672-71-3249) --这个作者(486-29-1786) 出了两本书(PC9999,PS7777) --5_1,错的 select p.pub_id,SUM(price),MAX(price),count(title_id) from publishers p inner join titles t on p.pub_id=t.pub_id group by p.pub_id go --5_2,正确的 select p.pub_id,SUM(price),MAX(price),count(distinct au_id) from publishers p inner join titles t on p.pub_id=t.pub_id inner join titleauthor ta on t.title_id=ta.title_id group by p.pub_id go --6,查看出版社编号,书总价,书最高价格,要求作者总数大于9的信息 select pub_id,SUM(price),MAX(price) from titles t inner join titleauthor ta on t.title_id=ta.title_id group by pub_id having count(distinct au_id)>9 go --7,查找书名称,书编号,作者编号 go --8,查找书名称,作者数量 select title,COUNT(au_id) '作者数量' from titles t inner join titleauthor ta on t.title_id=ta.title_id group by title go --9,查找商业书的所有书名称,作者数量, select title,COUNT(au_id) '作者数量' from titles t inner join titleauthor ta on t.title_id=ta.title_id where type='business' group by title go --10,查找商业书的所有作者姓名,作者编号,作者城市 select * from titles t inner join titleauthor ta on t.title_id=ta.title_id inner join authors a on ta.au_id=a.au_id where type='business' go --11,在CA州的作者出的书,书名,书单价总和, --书最高预付款,书的最低价格。 select title,SUM(price),MAX(advance),MIN(price) from titles t inner join titleauthor ta on t.title_id=ta.title_id inner join authors a on ta.au_id=a.au_id where state='CA' group by title go --12,和商店的同一州作者出的书,书名,书单价总和, --书最高预付款,书的最低价格。 --12_1, select au_id from authors a where state in(select state from stores where state=a.state) go --12_2, select distinct title_id from titleauthor ta where au_id in(select au_id from authors a where state in(select state from stores where state=a.state)) go --12_3, select * from titles t where title_id in(select distinct title_id from titleauthor ta where au_id in(select au_id from authors a where state in(select state from stores where state=a.state))) go --12_4,结论 select title,SUM(price),MAX(advance),MIN(price) from titles t where title_id in(select distinct title_id from titleauthor ta where au_id in(select au_id from authors a where state in(select state from stores where state=a.state))) group by title go --13,和商店的同一州作者出的书,书名,书单价总和, --书最高预付款,书的最低价格,要 --求书必须大于所有商业书的价格。 --13_1, select * from titles where price>(select max(price) from titles where type='business') go --13_2,总结 select title,SUM(price),MAX(advance),MIN(price) from titles t where title_id in(select distinct title_id from titleauthor ta where au_id in(select au_id from authors a where state in(select state from stores where state=a.state))) and price>(select max(price) from titles where type='business') group by title go --SQL脚本总结 --1,如果有条件“先做条件” --2,多列先链表,再做条件 --3, 先做条件后排序 --3,分组常和聚合函数在一起。 --4, --5,子查询,如果有已知条件用嵌套子查询,否则就是相关子查询。 --前(where 列条件)group by 后(having 组条件) select * from titles where type='business' order by title_id desc
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