SQL 查詢語句（備份）

分組查詢

1、分組查詢後獲取分組後的前5條資料

1

select
*from (select rid = row_number() over (partition by foodparentid order
by foodparentid desc), *
from foodlibinfo) as t where rid <=
5

2、分組查詢後隨機獲取每一組的5條資料

1

select
*from (select rid = row_number() over (partition by foodparentid order
bynewid()), *
from foodlibinfo) as t where rid <=
5

排名查詢：

1、使用row_number()函式，分數相同按照id公升序排名

1

select id,result,row_number() over (order
by result desc,id asc) as rowid from answer group
by q_user_id,q_result

2、分數相同的排名相同

select

a.id,a.result,
place
=(select
count(result) from answer where result>a.result )+
1from answer a where
order
by place

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