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SQL 知识及用法备忘录
1 ---查询当前数据库一共有多少张表 2 select COUNT(1) from sysobjects where xtype=‘U‘ 3 4 ---查询当前数据库有多少张视图 5 select COUNT(1) from sysobjects where xtype=‘V‘ 6 7 ---查询当前数据库 有多少个存储过程 8 select COUNT(1) from sysobjects where xtype=‘P‘ 9 10 -- row_number()函数用法 row_number() over (order by cloumn) from tableName 11 select ROW_NUMBER() over (order by cardNo ),* from T_ValueCard 12 13 14 select type from sysobjects group by type 15 -- 16 select * from sysobjects 17 18 19 --触发器 20 if not exists (select * from sysobjects where id=OBJECT_ID(‘Student‘) and name=‘Student‘) 21 begin 22 create table Student --学生表 23 ( 24 StudentID int primary key, --学号 25 StudentName nvarchar(15) --姓名 26 ) 27 end 28 29 if not exists (select * from sysobjects where id=OBJECT_ID(‘BorrowRecord‘) and name=‘BorrowRecord‘) 30 begin 31 create table BorrowRecord --借书记录表 32 ( 33 RecordID int primary key, --流水号 34 StudentID int, --学号 35 OutTime datetime, --借出时间 36 ReturnDate datetime --归还时间 37 ) 38 end 39 40 --创建触发器语法 41 --create trigger trigger_name 42 43 --on {table_name | view_name} 44 45 --{for | After | Instead of } [ insert, update,delete ] 46 47 --as sql_statement 48 49 --删除触发器 drop trigger trigger_name 50 51 -- 查看当前数据库的触发器 52 --select * from sysobjects where type=‘TR‘ 53 --查看某个触发器 54 --exec sp_helptext ‘TStudent‘ 55 56 --触发器实例----触发器是属于隐式的 57 --create trigger TStudent 58 --on Student --在Student表中创建触发器 59 --for Update --针对什么事件触发 60 --as --时间触发后要做的事情 61 --if update(StudentID) 62 --begin 63 -- Update BorrowRecord 64 -- set StudentID=i.StudentID 65 -- from BorrowRecord br,Deleted d,Inserted i --Deleted和Inserted为临时虚拟表 66 -- where br.StudentID=d.StudentID 67 --end 68 --go 69 70 --查询的时候临时生成自定义数据列 71 select ‘Web‘ as SourceName,* from TM_Goods 72 --生成空列数据 73 select ‘‘ as SourceName, * from TM_Goods 74 75 76 77 --- 所查列的值出现特殊结果字符 给这个结果字符加单引号 如下所示的Sex字段 78 select top 20 ID, GuestName,MemNo,CardNo, [Identity], BagNo,BoxNo,case Sex when ‘M‘ then ‘男‘ when ‘F‘ then ‘女‘ end as Sex,Holes, 79 case [Status] when 1 then ‘已预约‘ when 2 then ‘已来场登记‘ when 3 then ‘已球场登记‘ when 4 then ‘已出发‘ 80 when 5 then ‘已离场‘ when 6 then ‘已结账‘ when 7 then ‘退回结账‘ when -1 then ‘已取消预约‘ when -2 then ‘取消登记‘ 81 when 0 then ‘未知‘ end as [Status], 82 StrategyCode, CreateTime,CheckinTime, Creator, CheckOutTime, CheckoutUser, 83 LastEditTime, LastEditor ,ExpiryDate, MainCardNo, 84 SalemanCode from Checkin 85 86 ---查询的时候如果结果里面包含空格或者特殊字符可以等量替换然后在进行查询 87 select * from TM_Goods where REPLACE(Name,‘ ‘,‘‘)=REPLACE(‘海立得 车载型空气净化机‘,‘ ‘,‘‘) 88 89 ---死锁有关脚本 90 create proc [dbo].[p_lockinfo] 91 @kill_lock_spid bit=1, --是否杀掉死锁的进程,1 杀掉, 0 仅显示 92 @show_spid_if_nolock bit=1 --如果没有死锁的进程,是否显示正常进程信息,1 显示,0 不显示 93 as 94 declare @count int,@s nvarchar(1000),@i int 95 select id=identity(int,1,1),标志, 96 进程ID=spid,线程ID=kpid,块进程ID=blocked,数据库ID=dbid, 97 数据库名=db_name(dbid),用户ID=uid,用户名=loginame,累计CPU时间=cpu, 98 登陆时间=login_time,打开事务数=open_tran, 进程状态=status, 99 工作站名=hostname,应用程序名=program_name,工作站进程ID=hostprocess, 100 域名=nt_domain,网卡地址=net_address 101 into #t from( 102 select 标志=‘死锁的进程‘, 103 spid,kpid,a.blocked,dbid,uid,loginame,cpu,login_time,open_tran, 104 status,hostname,program_name,hostprocess,nt_domain,net_address, 105 s1=a.spid,s2=0 106 from master..sysprocesses a join ( 107 select blocked from master..sysprocesses group by blocked 108 )b on a.spid=b.blocked where a.blocked=0 109 union all 110 select ‘|_牺牲品_>‘, 111 spid,kpid,blocked,dbid,uid,loginame,cpu,login_time,open_tran, 112 status,hostname,program_name,hostprocess,nt_domain,net_address, 113 s1=blocked,s2=1 114 from master..sysprocesses a where blocked<>0 115 )a order by s1,s2 116 117 select @count=@@rowcount,@i=1 118 119 if @count=0 and @show_spid_if_nolock=1 120 begin 121 insert #t 122 select 标志=‘正常的进程‘, 123 spid,kpid,blocked,dbid,db_name(dbid),uid,loginame,cpu,login_time, 124 open_tran,status,hostname,program_name,hostprocess,nt_domain,net_address 125 from master..sysprocesses 126 set @count=@@rowcount 127 end 128 129 if @count>0 130 begin 131 create table #t1(id int identity(1,1),a nvarchar(30),b Int,EventInfo nvarchar(255)) 132 if @kill_lock_spid=1 133 begin 134 declare @spid varchar(10),@标志 varchar(10) 135 while @i<=@count 136 begin 137 select @spid=进程ID,@标志=标志 from #t where id=@i 138 insert #t1 exec(‘dbcc inputbuffer(‘+@spid+‘)‘) 139 if @标志=‘死锁的进程‘ exec(‘kill ‘+@spid) 140 set @i=@i+1 141 end 142 end 143 else 144 while @i<=@count 145 begin 146 select @s=‘dbcc inputbuffer(‘+cast(进程ID as varchar)+‘)‘ from #t where id=@i 147 insert #t1 exec(@s) 148 set @i=@i+1 149 end 150 select a.*,进程的SQL语句=b.EventInfo 151 from #t a join #t1 b on a.id=b.id 152 end153 GO
SQL 知识及用法备忘录
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