資料庫開發——精典
1.按姓氏筆畫排序:
select * from tablename order by customername collate
chinese_prc_stroke_ci_as
2.資料庫加密:
select encrypt('原始密碼')
select pwdencrypt('原始密碼')
select pwdcompare('原始密碼','加密後密碼') = 1--相同；否則不相同
encrypt('原始密碼')
select pwdencrypt('原始密碼')
select pwdcompare('原始密碼','加密後密碼') = 1--相同；否則不相同
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.檢視硬碟分割槽:
exec
master..xp_fixeddrives
5.比較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.殺掉所有的事件探察器程序:
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.記錄搜尋:
開頭到n條記錄
select top n * from 表
-------------------------------
n到m條記錄(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
----------------------------------
n到結尾記錄
select top n * from 表 order by id desc
8.如何修改資料庫的名稱:
sp_renamedb 'old_name', 'new_name'
9：獲取當前資料庫中的所有使用者表
select name from sysobjects where xtype='u' and status>=0
10：獲取某乙個表的所有字段
select name from syscolumns where id=object_id('表名')
select a.* from sysobjects a, syscomments b where a.id = b.id and b.text like '%表名%'
12：檢視當前資料庫中所有儲存過程
select name as 儲存過程名稱 from sysobjects where xtype='p'
13：查詢使用者建立的所有資料庫
select * from master..sysdatabases d where sid not in(select sid from master..syslogins where name='sa')
或者select dbid, name as db_name from master..sysdatabases where sid <> 0x01
14：查詢某乙個表的字段和資料型別
select column_name,data_type from information_schema.columns
where table_name = '表名'
資料庫開發 精典
1.按姓氏筆畫排序 select from tablename order by customername collate chinese prc stroke ci as 2.資料庫加密 select encrypt 原始密碼 select pwdencrypt 原始密碼 select pwdco...
資料庫開發 精典
1.按姓氏筆畫排序 select from tablename order by customername collate chinese prc stroke ci as 2.資料庫加密 select encrypt 原始密碼 select pwdencrypt 原始密碼 select pwdco...
資料庫開發 精典
1.按姓氏筆畫排序 select from tablename order by customername collate chinese prc stroke ci as 2.資料庫加密 select encrypt 原始密碼 select pwdencrypt 原始密碼 select pwdco...