--进货表没有进货数量select a.KH_MC,(select CX_MC from CX_BIAO where CX_ID=b.JH_CX),count(*)from KH_BIAO ajoin JH_BIAO b on a.KH_ID=b.JH_KHgroup by KH_ID,b.JH_CX--进货表有进货数量select a.KH_MC,(select CX_MC from CX_BIAO where CX_ID=b.JH_CX),sum(数量)from KH_BIAO ajoin JH_BIAO b on a.KH_ID=b.JH_KHgroup by KH_ID,b.JH_CX