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    >SQL高手篇：精妙SQL語(yǔ)句介紹　創(chuàng)建者：webmaster　更新時(shí)間：2008-11-27 09:22

    1. 說(shuō)明：復(fù)制表(只復(fù)制結(jié)構(gòu)，源表名：a，新表名：b)

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

    2. 說(shuō)明：拷貝表(拷貝數(shù)據(jù)，源表名：a，目標(biāo)表名：b)

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

    3. 說(shuō)明：顯示文章、提交人和最后回復(fù)時(shí)間 

    SQL: select a.title, a.username, b.adddate 
     from table a,(
          select max(adddate) adddate 
          from table where table.title=a.title) b 　


    4. 說(shuō)明：外連接查詢(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. 說(shuō)明：日程安排提前五分鐘提醒 

    SQL: select * 
     from 日程安排 
     where datediff(''minute'', f開始時(shí)間, getdate())>5 　　
    　　

    6. 說(shuō)明：兩張關(guān)聯(lián)表，刪除主表中已經(jīng)在副表中沒(méi)有的信息 

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


    7. 說(shuō)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. 說(shuō)明：—— 

    SQL: select * 
     from studentinfo 
     where not exists(select * from student where studentinfo.id=student.id) 
           and 系名稱=''"&strdepartmentname&"''
           and 專業(yè)名稱=''"&strprofessionname&"''
     order by 性別, 生源地, 高考總成績(jī);




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