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闂鎻忚堪錛氳姹傛煡璇㈠嚭鍦╝琛紝鑰屼笉鍦╞琛ㄧ殑鏁版嵁錛岄�氳繃3涓瓧孌碉紝鍒嗗埆鏄痑1,b1,c1,鍜宐琛╝1,b1,c1.鍏朵腑a1,鐨勫�間負絀恒�傚湪榪涜姣旇緝鏃跺姙娉曟紜垽鏂嚭銆?br />
姣旇緝鍦熺殑瑙ｅ喅鏂規銆傛妸null鍊煎緱瀛楁淇敼涓轟竴涓粯璁ゅ�煎1.nvl()鍑芥暟濂藉儚涔熶笉璧烽噸瑕併�傜暀鐫�浠ュ悗鎬濊�冿紝濡傛灉鍝綅楂樻墜鐭ラ亾鐨勮瘽錛岃閫氱煡涓�涓嬨�傚湪姝ゅ厛璋㈣阿浜嗐�?br />
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