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
相关文档：
MySQL:
SELECT column from table
ORDER BY RAND()
LIMIT 1
PostgreSQL:
SELECT column from table
ORDER BY RANDOM()
LIMIT 1
Microsoft SQL Server:
SELECT TOP 1 column from table
ORDER BY NEWID()
IBM DB2
SELECT column, RAND() as IDX
from table
ORDER BY IDX FETCH FIRST 1 ROWS ONLY
Thanks Ti ......
应一个朋友的要求，贴上收藏的SQL常用分页的办法～～
表中主键必须为标识列，[ID] int IDENTITY (1,1)
1.分页方案一：(利用Not In和SELECT TOP分页)
语句形式：
SELECT TOP 页记录数量 *
from 表名
WHERE (ID NOT IN
(SELECT TOP (每页行数*(页数-1)) ID
from � ......
/*
本文专注于将Excel导入SQL SERVER2005数据库
此路径下的这个工具，是SQL SERVER2005 用来导入导出数据的工具。
C:\Program Files\Microsoft SQL Server\90\DTS\Binn\DTSWizard.exe
一般在数据库名上--右键-->Tasks-->Import Data -->界面就出来了，和点击上面的工具是一个东西。
首次使用这个D ......
SQL宝典
SQL必知必会第三版
SQL入门经典第四版
Sams Teach Yourself SQL in 10 Minutes Third Edition
SQL The Complete Reference
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Suppose we have a recursive hierarchy stored in a relational database and we want to write it to XML. This might be for a variety of reasons – e.g. as a pre-cached input to a UI control, to export to another system using a pre-defined format, etc.
In SQL Server 2000, in order to ......
