SELECT A.编码,A.名称,B.采购数量,,C.质量,D检验数量 FROM A
LEFT JOIN B ON A.id_1 = B.id_1
LEFT JOIN C ON B.id_2 = B.id_2
提示出错 应该怎么写呢
SELECT A.编码,A.名称,B.采购数量,C.质量,D检验数量 FROM A
FULL JOIN B ON A.id_1 = B.id_1
FULL JOIN C ON B.id_2 = C.id_2
你后面的left join 写错表名了