Mysql 單表查詢各班級(jí)總分前三名

select class,total,name from (select *,ywsc+sxsc as total from st ORDER BY total DESC) b

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where

not EXISTS(select * from (select *,ywsc+sxsc as total from st ORDER BY total DESC) c where c.class=b.class and b.total c.total GROUP BY c.class HAVING COUNT(*)2 )

ORDER BY b.class,b.total DESC

MYSQL如何查詢記錄集的前3條記錄

SELECT * FROM 表 LIMIT 0, 3LIMIT 接受一個(gè)或兩個(gè)數(shù)2113字參數(shù)。參數(shù)必須是5261一個(gè)整數(shù)常量。如果給定4102兩個(gè)參數(shù)，第一1653個(gè)參數(shù)指定第一個(gè)返回記錄行的偏移量，第二個(gè)參數(shù)指定返回記錄行的最大數(shù)目。初始記錄行的偏移量是 0(而不是 1)

select scrname,stucount from scrtab

select top 3 scrname,stucount from scrtab order by stucount

先按人數(shù)排序，然后在查出前三個(gè)

sql server查詢前n條記錄：

因?yàn)閕d可能不是連續(xù)的，所以不能用取得10

mysql版 查詢各科成績(jī)前三名的記錄:(不考慮成績(jī)并列情況)

上面那條答案應(yīng)該是可以的啊，可能是看起來(lái)復(fù)雜了點(diǎn)吧，我自己試過(guò)是沒(méi)問(wèn)題的：

SELECT t1.sno,t1.cno,Score

FROM SC t1

WHERE EXISTS

(SELECT COUNT(1)

FROM SC

WHERE t1.cno= cno AND t1.scorescore

HAVING COUNT(1)3)

ORDER BY t1.cno,score DESC

另外還有一種類似的寫法：

SELECT t1.sno,t1.cno,Score

FROM SC t1

WHERE

(SELECT COUNT(cno)

FROM SC

WHERE t1.cno= cno AND t1.scorescore)3

ORDER BY t1.cno,score DESC