sql 成绩分组查询
时间：2011-05-05 来源：汪日平
SELECT '60-69 'as a ,count(*)
FROM vb where mark>=60 and mark<=69
UNION ALL SELECT '70-79 'as a,count(*)
FROM vb where mark >=70 and mark<=79
UNION ALL SELECT '80-89 'as a,count(*)
FROM vb where mark >=80 and mark<=89
UNION ALL SELECT '90-99 'as a,count(*)
FROM vb where mark >=90 and mark<=99;
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