共用分区和分桶
分区表中，可以嵌套分桶
命令怎么写？有什么实际意义？用了之后有什么效果？
“partitioned by”必须在“clustered by”前面
制作3个文件：
分为三个去插入
可以测试一下如果分桶在分区后面的效果怎么样
create table t_bucket_partition(id int)
clustered by (id) into 3 buckets
partitioned by (type string)
row format delimited fields terminated by '\t';
FAILED: ParseException line 3:0 missing EOF at 'partitioned' near 'buckets'
create table t_partition_bucket(id int)
partitioned by (type string)
clustered by (id) into 3 buckets
row format delimited fields terminated by '\t';
说明：“partition (type='test')”需要提前
分为三个文件，把数据加载到hive中的数据库中去试一下
partition_bucket1
1
2
3
4
partition_bucket2
5
6
7
8
partition_bucket3
9
10
11
12
然后把数据加载到对应的表格中去
load data local inpath '/home/briup/bd1902_hive/partition_bucket1' into table t_partition_bucket partition(type='1');
load data local inpath '/home/briup/bd1902_hive/partition_bucket2' into table t_partition_bucket partition(type='2');
load data local inpath '/home/briup/bd1902_hive/partition_bucket3' into table t_partition_bucket partition(type='3');
加载完后查看一下数据：
select * from t_partition_bucket;
查看一下分区：
show partitions t_partition_bucket;
然后以分桶形式查看数据：
select * from t_partition_bucket tablesample(bucket 2 out of 3 on id);
