后面说了SQL资料库常见句子，那时给他们说下SQL资料库强化基本功。
1、1=1，1=2的采用，在SQL句子女团中用的非常多
“where 1=1” 是则表示优先选择全数 “where 1=2”全数说实话，
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
他们能间接写出
严重错误!未被发现产品目录项。
set @strSQL = select count(*) as Total from [ + @tblName + ] where 1=1 安稳 + @strWhere 2、膨胀资料库
–复建检索
DBCC REINDEX
DBCC INDEXDEFRAG
–膨胀统计数据和笔记
DBCC SHRINKDB
DBCC SHRINKFILE
3、压缩资料库
dbcc shrinkdatabase(dbname)
4、转移资料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、修复资料库
ALTER DATABASE [dvbbs] SET SINGLE_USER
GO
DBCC CHECKDB(dvbbs,repair_allow_data_loss) WITH TABLOCK
GO
ALTER DATABASE [dvbbs] SET MULTI_USER
GO
7、笔记清除
SET NOCOUNT ON
DECLARE @LogicalFileName sysname,
@MaxMinutes INT,
@NewSize INT
USE tablename — 要操作的资料库名
SELECT @LogicalFileName = tablename_log, — 笔记文件名
@MaxMinutes = 10, — Limit on time allowed to wrap log.
@NewSize = 1 — 你想设定的笔记文件的大小(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
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、存储更改全数表
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
FETCH NEXT FROM curObject INTO @Name, @Owner
END
close curObject
deallocate curObject
GO
10、SQL SERVER中间接循环写入统计数据
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
