Hive使用小记

• 内部表与外部表之间的转换
  查阅官网：https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL
  官网关于内部表、外部表转换的解释：

  • TBLPROPERTIES (“EXTERNAL”=”TRUE”) in release 0.6.0+ (HIVE-1329) – Change a managed table to an external table and vice versa for “FALSE”.

    • As of Hive 2.4.0 (HIVE-16324) the value of the property ‘EXTERNAL’ is parsed as a boolean (case insensitive true or false) instead of a case sensitive string comparison.

    示例：
    alter table tableName set tblproperties ('EXTERNAL'='TRUE|FALSE');

• 修改分区字段
  查阅官网：https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL
  
  示例：
  ALTER TABLE table_name PARTITION (dt='2018-05-06') RENAME TO PARTITION (dt='20180506');