SQL语法系列三

1、

---通用表表达式CTE
with cte
as
(
select *  from dbo.LbtProjectInfo
)
select ID,ProjectName,ContractNumber  from  cte

-----通用表表达式CTE
-----连接查询
with  ProjectCte(ID,ProjectName,ContractNumber)
as
(
SELECT  ID,ProjectName,ContractNumber  from LbtProjectInfo
)
SELECT  c.id,c.htmc,c.xmbh  FROM ContractRview c
inner join  ProjectCte ct
on c.xmbh=ct.ContractNumber
order by ct.ID

相关文档：http://www.cnblogs.com/libingql/p/4461715.html



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----sqlserver查询当前库下，一张表的表名，字段名，字段类型，字段长度
select a.name LbtProjectInfo,b.name 字段名,c.name 字段类型,c.length 字段长度 from sysobjects a,syscolumns b,systypes c where a.id=b.id
and a.name='LbtProjectInfo' and a.xtype='U'
and b.xtype=c.xtype