sql code zz...

1. 说明：复制表(只复制结构，源表名：a，新表名：b)

SQL: select * into b from a where 1<>1;

2. 说明：拷贝表(拷贝数据，源表名：a，目标表名：b)

SQL: insert into b(a, b, c) select d, e, f from b;

3. 说明：显示文章、提交人和最后回复时间

SQL: select a.title, a.username, b.adddate from table a,

( select max(adddate) adddate from table where table.title=a.title) b 　

4. 说明：外连接查询(表名1：a，表名2：b)

SQL: select a.a, a.b, a.c, b.c, b.d, b.f from a LEFT OUT JOIN b ON a.a = b.c; 　

5. 说明：日程安排提前五分钟提醒

SQL: select * from 日程安排 where datediff(’’minute’’, f开始时间, getdate())>5 　　 　　

6. 说明：两张关联表，删除主表中已经在副表中没有的信息

SQL: delete from info where not exists( select * from infobz where info.infid=infobz.infid );

7. 说明：——

SQL: SELECT A.NUM, A.NAME, B.UPD_DATE, B.PREV_UPD_DATE FROM TABLE1,

(SELECT X.NUM, X.UPD_DATE, Y.UPD_DATE PREV_UPD_DATE FROM

 (SELECT NUM, UPD_DATE, INBOUND_QTY, STOCK_ONHAND FROM TABLE2

WHERE TO_CHAR(UPD_DATE,’’YYYY/MM’’) = TO_CHAR(SYSDATE, ’’YYYY/MM’’)) X,

(SELECT NUM, UPD_DATE, STOCK_ONHAND FROM TABLE2 WHERE TO_CHAR(UPD_DATE,’’YYYY/MM’’)

= TO_CHAR(TO_DATE(TO_CHAR(SYSDATE, ’’YYYY/MM’’) || ’’/01’’,’’YYYY/MM/DD’’) - 1, ’’YYYY/MM’’) ) Y,

WHERE X.NUM = Y.NUM （+）AND X.INBOUND_QTY + NVL(Y.STOCK_ONHAND,0) <> X.STOCK_ONHAND ) B

WHERE A.NUM = B.NUM;　 　　 8. 说明：—— SQL: select * from studentinfo

where not exists(select * from student where studentinfo.id=student.id) and

系名称=’’"&strdepartmentname&"’’ and 专业名称=’’"&strprofessionname&"’’

order by 性别, 生源地, 高考总成绩;

 

 

--以下代码放在作业里做调度，自动备份、自动删除4天前备份--创建映射exec master..xp_cmdshell 'net use w: /DatabaseBackup$  "password"/user:Roy',NO_OUTPUTgo-----2000用游标:declare @s nvarchar(200),@del nvarchar(200)select  @s='',@del=''declare datebak cursor forselect     [bak]='backup database  '+quotename(Name)+'  to disk =''w:'+Name+'_'+convert(varchar(8),getdate(),112)+'.bak''  with init',    [del]='exec master..xp_cmdshell '' del w:'+Name+'_'+convert(varchar(8),getdate()-4,112)+'.bak'', no_output' from master..sysdatabases where dbid>4 --不备份系统数据库open datebakfetch next from datebak into @s,@delwhile @@fetch_status=0    begin        exec (@del)        exec(@s)        fetch next from datebak into @s,@del    endclose datebakdeallocate datebakgo--删除映射exec master..xp_cmdshell 'net use w: /delete'go