SQL知识整理
一：Select语句：
select 字段名 from 表名 where 条件 order by 排序
see:select distinct 从多个相同字段中抓唯一值
see:查找ld_det_andy表中有数据但ld_det_temp表中没数据的数据
select * from ld_det_andy a where
(not exists (select * from ld_det_temp where ld_loc = a.ld_loc and ld_part = a.ld_part))
see:选出累计访问量最大的10个ip地址，并按访问量降序排列。
select top 10 ip, countip from
(select ip,count(*) as countip from records group by ip) a
order by countip desc
see:表student(id,name,score)根据分数列（score）每10分为一段，查询每段分数的人数
select ScoreRank,count(*) from
(select ScoreRank = case
when score >= 0 and score < 10 then '0-9'
when score >= 10 and score < 20 then '10-19'
when score >= 20 and score < 30 then '20-29'
when score >= 30 and score < 40 then '30-39'
when score >= 40 and score < 50 then '40-49'
when score >= 50 and score < 60 then '50-59'
when score >= 60 and score < 70 then '60-69'
when score >= 70 and score < 80 then '70-79'
when score >= 80 and score < 90 then '80-89'
&nb
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