我在create table （表名）（
）DEFAULT CHARSET = utf8；加上utf8这一句
CREATE TABLE air_quality_index(
id INT PRIMARY KEY AUTO_INCREMENT,
district_id INT ,
monitor_time DATE NOT NULL,
pm10 INT NOT NULL,
pm25 INT NOT NULL,
monitoring_station VARCHAR(500) NOT NULL,
last_modify_time DATE NOT NULL
)DEFAULT CHARSET = utf8;
