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ǰÈÕ½á´æÊýÁ¿ =(select sum(case when Èë³ö¿â='Èë¿â' then ½»»õÊýÁ¿ else 0 end), -sum(case when Èë³ö¿â='³ö¿â' then ½»»õÊýÁ¿ else 0 end) from tb where ¿Í»§Ãû³Æ = 'A' and ²úÆ·Æ·Ãû = 'A01' and µÇ¼ÇÈÕÆÚ<'2010-05-20'),--£¨µÇ¼ÇÈÕÆÚǰһÌìÒÔǰµÄÈë¿âµÄ½»»õÊýÁ¿ºÏ¼Æ-³ö¿âµÄ½»»õÊýÁ¿ºÏ¼Æ£©£¬
±¾ÈÕÈë¿âÊýÁ¿ = sum(case when Èë³ö¿â='Èë¿â' then ½»»õÊýÁ¿ else 0 end),--£¨µÇ¼ÇÈÕÆÚÄÇÌìµÄÈë¿âÊýÁ¿ºÏ¼Æ£©£¬
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