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1 清空表,hive> truncate table sales_info;
hive> select * from sales_info ;
OK
123 华为Mate10 31 999.0 20
Time taken: 0.039 seconds, Fetched: 1 row(s)
hive> truncate table sales_info;
OK
Time taken: 0.091 seconds
hive> select * from sales_info ;
OK
Time taken: 0.035 seconds
hive>
2 查询显示字段名,hive> set hive.cli.print.header=true;
hive> set hive.cli.print.header=true;
hive> select * from sales_info ;
OK
sku_id sku_name category_id3 price sales_count
123 华为Mate10 31 999.0 20
456 华为Mate30 31 2999.0 30
789 小米5 31 800.0 20
1235 小米6 31 900.0 100
4562 OPPO Findx 31 3900.0 50
Time taken: 0.043 seconds, Fetched: 5 row(s)
hive>
end