修改

列的名称、类型、位置、注释

hive>ALTER TABLE t3 CHANGE COLUMN old_name new_name String [COMMENT '...'] [AFTER column2];

实例

hive (zmgdb)> alter table t1 change column car sarly int after office;
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask. Unable to alter table. The following columns have types incompatible with the existing columns in their respective positions :
sarly

----字段car是string类型与int类型不兼容，不能强转。

hive (zmgdb)> alter table t1 change column car sarly string after office;
OK
Time taken: 0.132 seconds
hive (zmgdb)> desc t1;
OK
col_name        data_type       comment
name                    string                                      
address                 string                                      
company                 string                                      
office                  string                                      
sarly                   string                                      
Time taken: 0.035 seconds, Fetched: 5 row(s)
hive (zmgdb)> 

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