1、1=1，1=2的使用，在SQL语句组合时用的较多
“where 1=1” 是表示选择全部 “where 1=2”全部不选， 如：
if @strWhere !='' begin
set @strSQL = 'select count(*) as Total from [' + @tblName + '] where ' + @strWhere end else begin
set @strSQL = 'select count(*) as Total from [' + @tblName + ']' end
我们可以直接写成
错误！未找到目录项。
set @strSQL = 'select count(*) as Total from [' + @tblName + '] where 1=1 安定 '+ @strWhere 2、收缩数据库 --重建索引 DBCC REINDEX
DBCC INDEXDEFRAG --收缩数据和日志 DBCC SHRINKDB DBCC SHRINKFILE
3、压缩数据库
dbcc shrinkdatabase(dbname)
4、转移数据库给新用户以已存在用户权限
exec sp_change_users_login 'update_one','newname','oldname' go
5、检查备份集
RESTORE VERIFYONLY from disk='E:\\dvbbs.bak'
6、修复数据库
ALTER DATABASE [dvbbs] SET SINGLE_USER GO
DBCC CHECKDB('dvbbs',repair_allow_data_loss) WITH TABLOCK GO
ALTER DATABASE [dvbbs] SET MULTI_USER GO
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7、日志清除 SET NOCOUNT ON
DECLARE @LogicalFileName sysname, @MaxMinutes INT, @NewSize INT
USE tablename -- 要操作的数据库名
SELECT @LogicalFileName = 'tablename_log', -- 日志文件名 @MaxMinutes = 10, -- Limit on time allowed to wrap log. @NewSize = 1 -- 你想设定的日志文件的大小(M)
Setup / initialize
DECLARE @OriginalSize int SELECT @OriginalSize = size FROM sysfiles
WHERE name = @LogicalFileName
SELECT 'Original Size of ' + db_name() + ' LOG is ' + CONVERT(VARCHAR(30),@OriginalSize) + ' 8K pages or ' + CONVERT(VARCHAR(30),(@OriginalSize*8/1024)) + 'MB' FROM sysfiles
WHERE name = @LogicalFileName CREATE TABLE DummyTrans
(DummyColumn char (8000) not null)
DECLARE @Counter INT, @StartTime DATETIME, @TruncLog VARCHAR(255)
SELECT @StartTime = GETDATE(),
@TruncLog = 'BACKUP LOG ' + db_name() + ' WITH TRUNCATE_ONLY' DBCC SHRINKFILE (@LogicalFileName, @NewSize) EXEC (@TruncLog)
-- Wrap the log if necessary.
WHILE @MaxMinutes > DATEDIFF (mi, @StartTime, GETDATE()) -- time has not expired
AND @OriginalSize = (SELECT size FROM sysfiles WHERE name = @LogicalFileName)
AND (@OriginalSize * 8 /1024) > @NewSize BEGIN -- Outer loop. SELECT @Counter = 0
WHILE ((@Counter < @OriginalSize / 16) AND (@Counter < 50000)) BEGIN -- update
INSERT DummyTrans VALUES ('Fill Log') DELETE DummyTrans
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SELECT @Counter = @Counter + 1 END
EXEC (@TruncLog) END
SELECT 'Final Size of ' + db_name() + ' LOG is ' + CONVERT(VARCHAR(30),size) + ' 8K pages or ' + CONVERT(VARCHAR(30),(size*8/1024)) + 'MB' FROM sysfiles
WHERE name = @LogicalFileName DROP TABLE DummyTrans SET NOCOUNT OFF
8、说明：更改某个表
exec sp_changeobjectowner 'tablename','dbo' 9、存储更改全部表
CREATE PROCEDURE dbo.User_ChangeObjectOwnerBatch @OldOwner as NVARCHAR(128), @NewOwner as NVARCHAR(128) AS
DECLARE @Name as NVARCHAR(128) DECLARE @Owner as NVARCHAR(128) DECLARE @OwnerName as NVARCHAR(128) DECLARE curObject CURSOR FOR select 'Name' = name,
'Owner' = user_name(uid) from sysobjects
where user_name(uid)=@OldOwner order by name
OPEN curObject
FETCH NEXT FROM curObject INTO @Name, @Owner WHILE(@@FETCH_STATUS=0) BEGIN
if @Owner=@OldOwner begin
set @OwnerName = @OldOwner + '.' + rtrim(@Name) exec sp_changeobjectowner @OwnerName, @NewOwner end
-- select @name,@NewOwner,@OldOwner
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FETCH NEXT FROM curObject INTO @Name, @Owner END
close curObject
deallocate curObject GO
10、SQL SERVER中直接循环写入数据
declare @i int set @i=1 while @i<30 begin
insert into test (userid) values(@i) set @i=@i+1 end
案例：
有如下表，要求就裱中所有沒有及格的成績，在每次增長0.1的基礎上，使他們剛好及格: Name score Zhangshan 80 Lishi 59 Wangwu 50 Songquan 69
while((select min(score) from tb_table)<60) begin
update tb_table set score =score*1.01 where score<60
if (select min(score) from tb_table)>60 break else
continue end
数据开发-经典
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1.按姓氏笔画排序:
Select * From TableName Order By CustomerName Collate Chinese_PRC_Stroke_ci_as //从少到多
2.数据库加密:
select encrypt('原始密码') select pwdencrypt('原始密码')
select pwdcompare('原始密码','加密后密码') = 1--相同；否则不相同 encrypt('原始密码')
select pwdencrypt('原始密码')
select pwdcompare('原始密码','加密后密码') = 1--相同；否则不相同 3.取回表中字段:
declare @list varchar(1000), @sql nvarchar(1000)
select @list=@list+','+b.name from sysobjects a,syscolumns b where a.id=b.id and a.name='表A'
set @sql='select '+right(@list,len(@list)-1)+' from 表A' exec (@sql)
4.查看硬盘分区:
EXEC master..xp_fixeddrives
5.比较A,B表是否相等:
if (select checksum_agg(binary_checksum(*)) from A) =
(select checksum_agg(binary_checksum(*)) from B) print '相等' else
print '不相等'
6.杀掉所有的事件探察器进程:
DECLARE hcforeach CURSOR GLOBAL FOR SELECT 'kill '+RTRIM(spid) FROM master.dbo.sysprocesses
WHERE program_name IN('SQL profiler',N'SQL 事件探查器') EXEC sp_msforeach_worker '?' 7.记录搜索:
开头到N条记录
Select Top N * From 表
-------------------------------
N到M条记录(要有主索引ID)
Select Top M-N * From 表 Where ID in (Select Top M ID From 表) Order by ID Desc
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