54 lines
746 B
Markdown
54 lines
746 B
Markdown
## hive 删除数据
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### 删除表
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```sql
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-- hive删除表：
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drop table table_name;
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-- 永久性删除，不能恢复：
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drop table table_name purge;
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```
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### 清空数据
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```sql
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-- hive删除表中数据：
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truncate table table_name;
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-- hive按分区删除数据：
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alter table table_name drop partition (partition_name='分区名')
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```
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### 重写数据
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与删除条件相反，如删除 date=0528 的数据
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那么 重写数 的条件为 date!=0528
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**分区表**
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```
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删除具体partition的部分数据
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INSERT OVERWRITE TABLE table_name PARTITION(year='2021')
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SELECT * FROM table_name WHERE year='2021' and xx;
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```
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**非分区表**
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```
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INSERT OVERWRITE TABLE table_name SELECT * FROM table_name WHERE xx;
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``` |