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SQL: select * into b from a where 1<>1;
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SQL: insert into b(a, b, c) select d, e, f from b;
        3. ˵Ã÷£ºÏÔʾÎÄÕ¡¢Ìá½»È˺Í×îºó»Ø¸´Ê±¼ä
SQL: select a.title, a.username, b.adddate
     from table a,(
          select max(adddate) adddate
          from table where table.title=a.title) b ¡¡
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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. ˵Ã÷£ºÈճ̰²ÅÅÌáǰÎå·ÖÖÓÌáÐÑ
SQL: select *
     from Èճ̰²ÅÅ
     where datediff(’’minute’’, f¿ªÊ¼Ê±¼ä, getdate())>5 ¡¡¡¡
¡¡¡¡
        6. ˵Ã÷£ºÁ½ÕŹØÁª±í£¬É¾³ýÖ÷±íÖÐÒѾ­ÔÚ¸±±íÖÐûÓеÄÐÅÏ¢
SQL: delete from info
     where not exists(
           select *
           from infobz
           where info.infid=infobz.infid );
        7. ˵Ã÷£º——
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
                    


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