项目中常用的SQL语句

/****** Script for SelectTopNRows command from SSMS  ******/
SELECT   [RoleId]
      ,[RoleOrderId]
      ,[RoleName]
      ,[RoleStatus]
      ,[RoleInsertTime]
      ,[RoleUpdateTime]
      ,[RoleRemark]
  FROM  [Math_RoleInfo]
   where exists
  ( SELECT * from Math_User_Role_Select 
  where [Math_RoleInfo].[RoleId]=Math_User_Role_Select.[RoleId])

/****** Script for SelectTopNRows command from SSMS  ******/
SELECT   [RoleId]
      ,[RoleOrderId]
      ,[RoleName]
      ,[RoleStatus]
      ,[RoleInsertTime]
      ,[RoleUpdateTime]
      ,[RoleRemark]
    , case  RoleStatus
     when 2 then ‘不正常‘
     else ‘默认值‘  
     end as Name1
  FROM  [Math_RoleInfo]
  

/****** Script for SelectTopNRows command from SSMS  ******/
SELECT   [RoleId]
      ,[RoleOrderId]
      ,[RoleName]
      ,[RoleStatus]
      ,[RoleInsertTime]
      ,[RoleUpdateTime]
      ,[RoleRemark]
    , case  
     when RoleStatus=2 then ‘不正常‘
     else ‘默认值‘  
     end as Name1
  FROM  [Math_RoleInfo]
  

select cast(1 as varchar(400)) as Name

select convert(varchar(10),getdate(),20)/*2018-02-27*/
select convert(varchar(10),getdate(),120) --2018-02-27
select convert(varchar(10),getdate(),102)--2018.02.27

/****** Script for SelectTopNRows command from SSMS  ******/
SELECT   [RoleId],max(isnull(RoleStatus,100)) as maliang
      
  FROM  [Math_RoleInfo]
  group by [RoleId]
  order by maliang
 
  

select dateadd(year,1,getdate())
select dateadd(month,1,getdate())
select dateadd(day,1,getdate())
select dateadd(quarter,1,getdate())

select year(getdate())
select month(getdate())
select day(getdate())

实例

例子 1

使用如下 SELECT 语句：

SELECT DATEDIFF(day,‘2008-12-29‘,‘2008-12-30‘) AS DiffDate

结果：

例子 2

使用如下 SELECT 语句：

SELECT DATEDIFF(day,‘2008-12-30‘,‘2008-12-29‘) AS DiffDate

结果：