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  • hive修改 表/分区语句

    参考 https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-AlterTable%2FPartitionStatements

    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
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  • 原文地址:https://www.cnblogs.com/ggjucheng/p/2843393.html
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