hive修改 表/分区语句
这里主要列一些常用操作。
添加分区
ALTER TABLE table_name ADD PARTITION (partCol = 'value1') location 'loc1'; //示例
ALTER TABLE table_name ADD IF NOT EXISTS PARTITION (dt='20130101') LOCATION '/user/hadoop/warehouse/table_name/dt=20130101'; //一次添加一个分区 ALTER TABLE page_view ADD PARTITION (dt='2008-08-08', country='us') location '/path/to/us/part080808' PARTITION (dt='2008-08-09', country='us') location '/path/to/us/part080809'; //一次添加多个分区
删除分区
ALTER TABLE login DROP IF EXISTS PARTITION (dt='2008-08-08'); ALTER TABLE page_view DROP IF EXISTS PARTITION (dt='2008-08-08', country='us');
修改分区
ALTER TABLE table_name PARTITION (dt='2008-08-08') SET LOCATION "new location";
ALTER TABLE table_name PARTITION (dt='2008-08-08') RENAME TO PARTITION (dt='20080808');
添加列
ALTER TABLE table_name ADD COLUMNS (col_name STRING); //在所有存在的列后面,但是在分区列之前添加一列
修改列
CREATE TABLE test_change (a int, b int, c int); // will change column a's name to a1 ALTER TABLE test_change CHANGE a a1 INT; // will change column a's name to a1, a's data type to string, and put it after column b. The new table's structure is: b int, a1 string, c int ALTER TABLE test_change CHANGE a a1 STRING AFTER b; // will change column b's name to b1, and put it as the first column. The new table's structure is: b1 int, a string, c int ALTER TABLE test_change CHANGE b b1 INT FIRST;
修改表属性:
alter table table_name set TBLPROPERTIES ('EXTERNAL'='TRUE'); //内部表转外部表 alter table table_name set TBLPROPERTIES ('EXTERNAL'='FALSE'); //外部表转内部表
表的重命名
ALTER TABLE table_name RENAME TO new_table_name
转自:http://www.cnblogs.com/ggjucheng/archive/2013/01/03/2843393.html