HIVE modify the table

1. Rename the
   syntax:
   the ALTER the Table table name rename to new table name;

2. Add Field:
   ALTER table Table add columns (1 Field Name Data Type 1, ...);

3. Alternatively modify the field all fields
   alter table table replace columns (1 Field Name Data Type 1, ...);

4. Nature of the partition table is added to add a new partition on a subdirectory HDFS
   ALTER table Table add partition (partition field = value, ...);

   alter table logs add partition (dt='2018-08-09',country='cq'); 
   alter table   studnet_p   add partition ( class='bigdata0003'  );
   

5. Delete Partition
   alter table table name drop partition (partition field = value, ...);
   alter table logs drop partition (dt = '2018-08-09', Country = 'CQ');
   alter table studnet_p drop partition (class = 'bigdata0003 ');

6. Modify a field
   alter table table name change columns (1 Field Name Data Type 1, ...);

Delete the table:

drop  table   if exists    表名

When the read mode: when the hive queries to check the correctness of the data card

Write mode: pass through a relational database, data is inserted to check the correctness of the data card