常用的不熟的sql语句

1.select * from dbo.Consum_AccountPaymentLog Where CHARINDEX(',1,',','+RelatedUserIDs+',')>0

charindex 在一个表达式中搜索另一个表达式并返回其起始位置（如果找到）。

之所以‘1’的两边加上‘，’号是为了防止‘11’，‘111’这样的数据扰乱搜索结果

2.select top 5 ProjectID  from Work_WorkLog WHERE UserID=3279  GROUP BY ProjectID HAVING COUNT(ProjectID)>0 ORDER BY COUNT(ProjectID) DESC

SELECT TOP 5 ProjectID ,ProjectName FROM Work_WorkLog WHERE UserID = #userId# AND IsDeleted = 0 AND WorkDate >= GETDATE() - 15 GROUP BY ProjectID ,
ProjectName
ORDER BY COUNT(*) DESC

根据一个列的数量多少来进行排序，先对列进行分组，然后判断是否含有该字段，然后根据字段排序，这里要注意的是红色部分要一致

3.select distinct(ProjectName),ProjectID from Work_WorkLog where UserID=3279 and IsDeleted=0 and ProjectID in(select top 5 ProjectID from Work_WorkLog where UserID=3279  group by ProjectID  ORDER BY COUNT(ProjectID) DESC)

可以筛选掉重复的数据

4.将字段为空的转化为拼音

Update Sys_Department Set PinYin=dbo.fun_getPY(Name) Where PinYin=''  其中dbo.fun_getPY(Name)为将中文首字母转化为拼音的方法

5.替换

update tra_CruiseItinerary set CruiseMap=REPLACE(CruiseMap,'upload','/upload')

 6.对text类型进行替换

update tra_CruiseItinerary set TravelDetail=REPLACE(CAST(TravelDetail as nvarchar(4000)),'<br>','')

6.将英文小写转大写

update Sys_Department set PinYin=UPPER(PinYin)

 7.根据某个字段重复的次数排序

select FromCity,COUNT(FromCity) as f from tra_TravelLine group by FromCity order by f desc

8.创建视图

iF EXISTS (SELECT * FROM sysobjects WHERE name = 'tra_AllTravelLine')
DROP VIEW tra_AllTravelLine
GO
CREATE VIEW tra_AllTravelLine
AS
SELECT NEWID() AS ID, Category = 0, Link = m.Link, Picture = m.TravelPic, Name = m.TravelName, Price = m.TravelPrice,SupplierID=m.SupplierID,Supplier = m.SupplierName, FromDate = m.FromDate, City = m.ToCity,
TravelDays = m.TravelDays, TravelNumber = m.TravelNumber, WebType = m.WebType, MobileLink = m.MobileLink,CreateDate=m.CreateDate,FromCity=m.FromCity,NotIncludeCity=m.NotIncludeCity
FROM tra_TravelLine m
UNION ALL
SELECT NEWID() AS ID, Category = 1, Link = n.Link, Picture = n.TravelPic, Name = n.TravelName, Price = n.TravelPrice,SupplierID=n.SupplierID,Supplier = n.SupplierName, FromDate = n.FromDate, City = n.ToCity,
TravelDays = n.TravelDays, TravelNumber = n.TravelNumber, WebType = n.WebType, MobileLink = n.MobileLink,CreateDate=n.CreateDate,FromCity=n.FromCity,NotIncludeCity=n.NotIncludeCity
FROM tra_SelfLine n
GO