结论
它的意思是按第一列分组,而不管它的名称是什么,ORDER BY 也同理可得~
SELECTperson_id, person_age^^^^^^^^12FROMpersonGROUPBY1;
Note : The number in ORDER BY and GROUP BY always start with 1 not with 0.
它的意思是按第一列分组,而不管它的名称是什么,ORDER BY 也同理可得~
SELECTperson_id, person_age^^^^^^^^12FROMpersonGROUPBY1;
Note : The number in ORDER BY and GROUP BY always start with 1 not with 0.