sql中常用动态的行转列
//取出源数据
select groupname,totalnum,inputdate,groupid into #temp from
(select count(*)as totalnum,p.groupid,g.groupname,convert(nvarchar(10),inputdate,120) as 'inputdate'
from person p left join admin_group g on p.groupid = g.groupid and deleteflag = '0'
where p.inactive='0'
group by p.groupid,g.groupname,convert(nvarchar(10),p.inputdate,120)) a
left join
(select a.groupid as areagroupid,b.groupname as area,b.areaid
from admin_group a inner join admin_group b on a.upperid = b.groupid) b on a.groupid=b.areagroupid
//第一种方式能够控制显示的数据的样式，速度比较快
declare @s nvarchar(max)
select @s = 'select groupname as 社区名,groupid'
select @s = @s + ',isnull(max(case when inputdate=''' + cast(inputdate as varchar(10)) + ''' then totalnum end),0) as ''' + cast(inputdate as varchar(10)) + '''' from #temp group by inputdate order by inputdate desc
select @s = @s + ' from #temp where groupid=71 group by groupname,groupid'
exec(@s)
//第二种使用pivot（sql2005以上版本中有）
declare @s nvarchar(max)
Select @s=isnull(@s+',','')+quotename(inputdate) from #temp group by inputdate order by inputdate desc
exec('select * from #temp pivot (max(totalnum) for inputdate in('+@s+'))b')
相关文档：
l INNER JOIN
内连接是最常见的一种连接，它页被称为普通连接，而E.FCodd最早称之为自然连接。
下面是ANSI SQL－92标准
select * from t_institution i
inner join t_teller t
on i.inst_no = t.inst_no //说两个表之间的关系用ON
where i.inst_no = "5801"
其中inner可以省� ......
use AdventureWorks
GO
SELECT c.LastName from Person.Contact c;
SELECT * from HumanResources.Employee e
INNER JOIN HumanResources.Employee m
ON e.ManagerID = m.EmployeeID; n
SELECT ProductID,Name,ProductNumber,ReorderPoint
from Production.Product
where ProductID in( select ProductID fro ......
--SQL高级程序设计：子查询
use AdventureWorks
GO
SELECT DISTINCT EmployeeID from HumanResources.JobCandidate WHERE EmployeeID IS NOT NULL;
SELECT e.EmployeeID,FirstName,LastName
from HumanResources.Employee e
INNER JOIN Person.Contact c
ON e.ContactID = c.ContactID
WHERE e.EmployeeID IN ......
phpmyadmin 修改执行sql文件大小限制
打开php.ini
post_max_size = 100M ; 表单提交文件大小上限
memory_limit = 128M ; 内存上限
upload_max_filesize = 100M ; 上传文件大小上限
修改以上三项，就可以解决。 但是此时PHPMYADMIN中最大限制：22,528 KB， ......
