[hive] Clear partition table and non-partition table specified content

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Clear the specified content of the table

Both partitioned and non-partitioned tables are applicable

1. truncate (only delete the data in the table, retain the table structure)

truncate table table_name; 
#truncate操作用于删除指定表中的所有行

Second, the partition table

1. Delete the specific partition

alter table table_name drop partition(partition_name='')

2. Delete some data of a specific partition

INSERT OVERWRITE TABLE table_name PARITION( etl_cycle_id='20230106') SELECT * FROM table_name WHERE etl_cycle_id<'20230106';
#WHERE后的条件是需要保留的数据的查询结果,即删除20230106之后的数据

Three, non-partitioned table

INSERT OVERWRITE TABLE table_name  SELECT * FROM table_name WHERE etl_cycle_id<'20230106';
#WHERE后的条件是需要保留的数据的查询结果,即删除20230106之后的数据