--查询数据库连接数
SELECT * FROM master.dbo.sysprocesses WHERE dbid IN
(
SELECT dbid FROM master.dbo.sysdatabases
WHERE NAME='数据库表名'
)--查询锁表
select request_session_id spid,OBJECT_NAME(resource_associated_entity_id) tableName
from sys.dm_tran_locks where resource_type='OBJECT'
ORDER BY request_session_id--杀掉进程
declare @spid int
Set @spid = 182 --锁表进程
declare @sql varchar(1000)
set @sql='kill '+cast(@spid as varchar)
exec(@sql)

--远程查询
--开户外围exec sp_configure 'show advanced options',1
reconfigure
exec sp_configure 'Ad Hoc Distributed Queries',1
reconfigure-------------------------------
select * from openrowset( 'SQLOLEDB', '服务器ip'; '数据库登录账号'; '数据库登录密码',数据库名.dbo.表名)
---------------------------------关闭外围exec sp_configure 'show advanced options',0
reconfigure
exec sp_configure 'Ad Hoc Distributed Queries',0
reconfigure

--压缩备份

Declare @strDataBaseName varchar(50)

Declare @FullFileName varchar(50)

Set @strDataBaseName='data'

Set @FullFileName='d:\db_backup\data20170222.bak'
BACKUP DATABASE @strDataBaseName TO DISK = @FullFileName WITH INIT, STATS = 20

--sql 事务
BEGIN TRAN 事物名IF(@@ERROR<>0)BEGIN ROLLBACK TRAN  事物名;RETURN;ENDCOMMIT TRAN  事物名--数据库清缓存
DBCC DROPCLEANBUFFERS--忽略自增列 按照sql语句的id新增
SET IDENTITY_INSERT [dbo].[EduMenuFunction] ON
--插入语句
SET IDENTITY_INSERT [dbo].[EduMenuFunction] OFF--修改语句联表修改
UPDATE    S_GB_StudentBasicInfo
SET BH =ci.BH
from S_GB_StudentBasicInfo sbi  WITH(NOLOCK),C_GB_ClassInfo ci WITH(NOLOCK)
where sbi.BJID=CONVERT(nvarchar(20),ci.ID)UPDATE    A
SET A.c2 =B.c3
from A inner join B on A.c1=B.c1--创建索引
CREATE INDEX DataReportIndex ON S_GB_StudentBasicInfo_DataReport(SFZJH (ASC), XB (ASC), CSRQ (ASC), DataYear (ASC), STATUS (ASC))--修改字段默认值
alter table 表名 drop constraint 约束名字   ------说明：删除表的字段的原有约束
alter table 表名 add constraint 约束名字 DEFAULT 默认值 for 字段名称 -------说明：添加一个表的字段的约束并指定默认值--修改字段名：
alter table 表名 rename column A to B--修改字段类型：
alter table 表名 alter column UnitPrice decimal(18, 4) not null --增加字段：
alter table 表名 ADD 字段 类型 NOT NULL Default 0--添加字段 [CardRecord][Birthday]
IF NOT EXISTS( SELECT * from syscolumns where [id]=object_id('CardRecord') AND[name]='Birthday' )BEGIN
Alter Table CardRecord Add Birthday DATETIME NOT NULL DEFAULT('1900-01-01 00:00:00') ;
EXEC sp_addextendedproperty 'MS_Description', '出生日期', 'user', dbo, 'table',CardRecord, 'column', Birthday;END--清除表数据，自增列从1开始truncate table 表名;--查询所有的子节点
with cte as
(
select * from Base_Company where Id = 'E7F5395E-6D11-4490-B3AD-513574268CF6' --查询节点
union all
select a.*
from Base_Company a join cte b on a.ParentId = b.id
where a.id is not null
)
select * from cte--创建数据库
USE mastercreate database AdayMS on  primary  -- 默认就属于primary文件组,可省略
 (/*--数据文件的具体描述--*/name='AdayMS_data',  -- 主数据文件的逻辑名称filename='E:\数据库\jaday\AdayMS\AdayMS_data.mdf', -- 主数据文件的物理名称size=5mb, --主数据文件的初始大小maxsize=100mb, -- 主数据文件增长的最大值filegrowth=15%--主数据文件的增长率
 )log on(/*--日志文件的具体描述,各参数含义同上--*/name='AdayMS_log',filename='E:\数据库\jaday\AdayMS\AdayMS_log.ldf',size=2mb,filegrowth=1mb)--根据时间筛选
datediff(dd,时间字段,当前时间)>=0--获取新增数据的标识列
insert语句;select @@IDENTITY--获取数据库表和视图中的所有字段
SELECT
列序号 = A.COLORDER,
列名 = A.NAME,
--主键 = CASE WHEN EXISTS(SELECT 1 FROM SYSOBJECTS WHERE XTYPE= 'PK ' AND PARENT_OBJ=A.ID AND NAME IN (
--SELECT NAME FROM SYSINDEXES WHERE INDID IN(
--SELECT INDID FROM SYSINDEXKEYS WHERE ID = A.ID AND COLID=A.COLID))) THEN '√ ' ELSE ' ' END,
类型 = B.NAME,
--允许空 = CASE WHEN A.ISNULLABLE=1 THEN '√ 'ELSE ' ' END,
列说明 = ISNULL(G.[VALUE], ' ')
FROM SYSCOLUMNS A
LEFT JOIN SYSTYPES B ON A.XUSERTYPE=B.XUSERTYPE
INNER JOIN SYSOBJECTS D ON A.ID=D.ID AND D.XTYPE= 'U ' AND D.NAME <> 'DTPROPERTIES '
LEFT JOIN SYSCOMMENTS E ON A.CDEFAULT=E.ID
LEFT JOIN sys.extended_properties G ON A.ID=G.major_id AND A.COLID=G.minor_id
LEFT JOIN sys.extended_properties F ON D.ID=F.major_id AND F.minor_id=0
WHERE (D.name='@TableName' )
ORDER BY
A.ID,A.COLORDER
--视图
SELECT
列序号 = A.COLORDER,
列名 = A.NAME,
--主键 = CASE WHEN EXISTS(SELECT 1 FROM SYSOBJECTS WHERE XTYPE= 'PK ' AND PARENT_OBJ=A.ID AND NAME IN (
--SELECT NAME FROM SYSINDEXES WHERE INDID IN(
--SELECT INDID FROM SYSINDEXKEYS WHERE ID = A.ID AND COLID=A.COLID))) THEN '√ ' ELSE ' ' END,
类型 = B.NAME,
--允许空 = CASE WHEN A.ISNULLABLE=1 THEN '√ 'ELSE ' ' END,
列说明 = ISNULL(G.[VALUE], ' ')
FROM SYSCOLUMNS A
LEFT JOIN SYSTYPES B ON A.XUSERTYPE=B.XUSERTYPE
INNER JOIN SYSOBJECTS D ON A.ID=D.ID AND d.xtype='V' AND D.NAME <> 'dtproperties '
LEFT JOIN SYSCOMMENTS E ON A.CDEFAULT=E.ID
LEFT JOIN sys.extended_properties G ON A.ID=G.major_id AND A.COLID=G.minor_id
LEFT JOIN sys.extended_properties F ON D.ID=F.major_id AND F.minor_id=0
WHERE (D.name='@ViewName' )
GROUP BY
A.COLORDER
,A.NAME
,B.NAME
,ISNULL(G.[VALUE], ' ')
,A.ID
ORDER BY
A.ID,A.COLORDER--触发器
ALTER TRIGGER [TRG_QBItem]
---------项触发器-------------------
ON [dbo].[QBItem]
FOR delete
AS
delete from QBOptions where ItemId in (select ItemId from deleted)--计算执行sql语句的时间
--首先 在各个sql 执行语句前加：
declare @time datetime
set @time=getdate()
--然后在sql执行语句后加上：
select [语句执行花费时间(毫秒)]=datediff(ms,@time,getdate())