题解 | #查询多列#

选择具体多列即可 select device_id,gender,age,university from user_profile

drop table if exists user_profile; CREATE TABLE user_profile ( id int NOT NULL, device_id int NOT NULL, gender varchar(14) NOT NULL, age int , university varchar(32) NOT NULL, province varchar(32) NOT NULL); INSERT INTO user_profile VALUES(1,2138,'male',21,'北京大学','BeiJing'); INSERT INTO user_profile VALUES(2,3214,'male',null,'复旦大学','Shanghai'); INSERT INTO user_profile VALUES(3,6543,'female',20,'北京大学','BeiJing'); INSERT INTO user_profile VALUES(4,2315,'female',23,'浙江大学','ZheJiang'); INSERT INTO user_profile VALUES(5,5432,'male',25,'山东大学','Shandong');