1、說明：顯示文章、送出人和最後回複時間
select a.title,a.username,b.adddate ,(select max(adddate) from table where table.title=a.title) adddate from table a
2、說明：兩張關聯表，删除主表中已經在副表中沒有的資訊
delete from table1 where not exists ( select * from table2 where table1.field1=table2.field1 )
3、說明：日程安排提前五分鐘提醒
SQL: select * from 日程安排 where datediff('minute',f開始時間,getdate())>5
4、說明：一條sql 語句搞定資料庫分頁
select top 10 b.* from (select top 20 主鍵字段,排序字段 from 表名 order by 排序字段 desc) a,表名 b where b.主鍵字段 = a.主鍵字段 order by a.排序字段
5、說明：選擇在每一組b值相同的資料中對應的a最大的記錄的所有資訊(類似這樣的用法可以用于論壇每月排行榜,每月熱銷産品分析,按科目成績排名,等等.)
select a,b,c from tablename ta where a=(select max(a) from tablename tb where tb.b=ta.b)
6、說明：包括所有在 TableA 中但不在 TableB和TableC 中的行并消除所有重複行而派生出一個結果表
(select a from tableA ) except (select a from tableB) except (select a from tableC)
7、說明：随機取出10條資料
select top 10 * from tablename order by newid()
8、說明：删除重複記錄
delete from tablename where id not in (select max(id) from tablename group by col1,col2,...)
10、說明：列出資料庫裡所有的表名
select name from sysobjects where type='U' // U代表使用者
11、說明：列出表裡的所有的列名
select name from syscolumns where id=object_id('TableName')
12、說明：列示type、vender、pcs字段，以type字段排列，case可以友善地實作多重選擇，類似select 中的case。
select type,sum(case vender when 'A' then pcs else 0 end),sum(case vender when 'C' then pcs else 0 end),sum(case vender when 'B' then pcs else 0 end) FROM tablename group by type
13、說明：選擇從10到15的記錄
select top 5 * from (select top 15 * from table order by id asc) table_别名 order by id desc
14、SQL SERVER中直接循環寫入資料
declare @i int
set @i=1
while @i<30
begin
insert into test (userid) values(@i)
set @i=@i+1
end
15 sp_executesql 用法
Declare @SQL nvarchar(max);
Declare @DonatorId int = 2;
Declare @DonatorName varchar(10);
set @SQL = 'SELECT * FROM dbo.Donators WHERE DonatorId = @id';
EXEC sp_executesql
@stmt = @SQL,
@params = N'@id as int',
@id = @DonatorId;
16.select DATENAME(DW,getdate()) as 今天周幾
17.查詢期刊的檔期期期号和下一期期号
SELECT TOP 100 A.[Id]
,A.[Issue]
,(SELECT MIN(ISSUE) FROM [Issue] B WHERE B.Issue>A.Issue ) NextIssue
FROM [Issue] A
18.sqlserver 存儲過程事務異常處理
CREATE PROCEDURE YourProcedure
AS
BEGIN
SET NOCOUNT ON;
BEGIN TRY---------------------開始捕捉異常
BEIN TRAN------------------開始事務
UPDATE A SET A.names = B.names FROM 表1 AS A INNER JOIN 表2 AS B ON A.id = B.id
UPDATE A SET A.names = B.names FROM 表1 AS A INNER JOIN 表2 AS B ON A.TEST = B.TEST
COMMIT TRAN -------送出事務
END TRY-----------結束捕捉異常
BEGIN CATCH------------有異常被捕獲
SELECT ERROR_NUMBER() AS ErrorNumber,
ERROR_SEVERITY() AS ErrorSeverity,
ERROR_STATE() as ErrorState,
ERROR_PROCEDURE() as ErrorProcedure,
ERROR_LINE() as ErrorLine,
ERROR_MESSAGE() as ErrorMessage;
IF @@TRANCOUNT > 0---------------判斷有沒有事務
BEGIN
ROLLBACK TRAN----------復原事務
END
EXEC YourLogErrorProcedure-----------記錄存儲過程執行時的錯誤資訊，自定義
END CATCH--------結束異常處理
END
19.行列轉換
SELECT [Id]
,[StudentName]
,[KeCheng]
,[ChengJi]
FROM [Mytest].[dbo].[ChengJi]
select [StudentName],
max(case(kecheng) when '數學' then chengji end) as '數學',
max(case(kecheng) when '國文' then chengji end) as '國文',
max(case(kecheng) when '英語' then chengji end) as '英語'
from [Mytest].[dbo].[ChengJi] group by [StudentName]
20 計算中null值得處理
SELECT COALESCE('',0) 結果0
SELECT COALESCE(' ',0) 結果0
SELECT COALESCE(null,0) 結果0
SELECT COALESCE(123,0) 結果123
SELECT ISNULL('',0) 結果''
SELECT ISNULL(null,0) 結果0
SELECT ISNULL(123,0) 結果123
由結果結果可以看出COALESCE函數對于空值處理和NULL值都起作用。
21 批量更新資料
update S_USER set account=p.account from S_PERSON p where p.id=S_USER.person_id;
update [ylb_play_type] set PlayOdds= v2.PlayOdds from (select * from [ylb_play_type] where LotteryId=13) v2where [ylb_play_type].LotteryId=14 and v2.PlayName=[ylb_play_type].PlayName