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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How things work :
SQL
Select
Statement
Introduction
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Ever asked your self how things work inside the
SQL
Select
statement? In this article we won’t be talking about how to writeSQL
Select
statem ......
Google dorks sql injection:
inurl:index.php?id=
inurl:trainers.php?id=
inurl:buy.php?category=
inurl:article.php?ID=
inurl:Play_old.php?id=
inurl:declaration_more.php?decl_id=
inurl:Pageid=
inurl:game ......
Cross Apply使表可以和表值函数结果进行join, 这样表值函数的参数就可以使用一个结果集，而不是一个标量值，下面是book online的原文，有例子，有解释。
The APPLY operator allows you to invoke a table-valued function for each row returned by an outer table expression of a query. The table-valued function act ......
在程序中有些查询语句相对较长，可以将语句单独写在一个XXX.sql文件中，在程序中读取SQL文件
具体涉及到
import java.io.File;
import org.apache.commons.io.FileUtils;
import java.net.URL;
URL resourceUrl = XXXX.class.getClassLoader().getResource(SQL_PATH+sqlName);//SQL_PATH具体SQL文件存在路径，sqlName� ......
