49 Hive修改表

增加/删除分区

语法结构:

ALTER TABLE table_name ADD [IF NOT EXISTS] partition_spec [ LOCATION 'location1' ] partition_spec [ LOCATION 'location2' ] ...
partition_spec:
: PARTITION (partition_col = partition_col_value, partition_col = partiton_col_value, ...)

ALTER TABLE table_name DROP partition_spec, partition_spec,...
      

具体实例:

alter table student_p add partition(part='a') partition(part='b');
      

重命名表

语法结构：

ALTER TABLE table_name RENAME TO new_table_name
      

具体实例：

增加/更新列

ALTER TABLE table_name ADD|REPLACE COLUMNS (col_name data_type [COMMENT col_comment], ...) 
      

ALTER TABLE table_name CHANGE [COLUMN] col_old_name col_new_name column_type [COMMENT col_comment] [FIRST|AFTER column_name]