sql中desc的妙用

很多情况下对表内部结构不熟悉，想看下我创建的表里面又多少表明，又想他按照首字母的规律排列，

这时候就要用desc +表名了。

desc t_bike_info;

hive> desc t_bike_info;
OK
guid                	string
bike_no             	string
city_guid           	string
city_name           	string
produce_time        	string
produce_batch_number	string
hardware_type       	int
bike_sim            	string
bike_color          	int
bike_key            	string
control_person_id   	string
online_time         	string
create_date         	string
update_date         	string
create_user_guid    	string
update_user_guid    	string
test_time           	string
unqualified_reason  	string
service_area_id     	string
service_area_name   	string
sum_running_distance	int
lng                 	double
lat                 	double
user_last_point_type	int
user_last_point_time	string
hardware_version    	string
firmware_version    	string
city_code           	string
pt                  	string

 hive> desc t_bike_info;
 OK
 guid                    string
 bike_no                 string
 city_guid               string
 city_name               string
 produce_time            string
 produce_factory_name    string
 produce_factory_guid    string
 produce_batch_number    string
 hardware_type           int
 bike_sim                string
 bike_color              int
 bike_type               int
 bike_status             int
 bike_running_status     int
 bike_hw_status          int
 bike_chip_status        int
 bike_key                string
 control_person_id       string
 control_person_name     string
 online_time             string
 create_date             string
 update_date             string
 create_user_guid        string
 update_user_guid        string
 test_time               string
 test_user_guid          string
 test_user_name          string
 unqualified_reason      string
 service_area_id         string
 service_area_name       string
 sum_running_distance    int
 lng                     double
 lat                     double
 user_last_point_type    int
 user_last_point_time    string
 hardware_version        string
 firmware_version        string
 city_code               string
 pt                      string