alter table dept_partition drop partition (day='20201222'), partition(day='20201223'); 1. 注意:在添加同时添加多个分区时,多个分区间用” ”(空格)间隔,在同时删除多个分区时,多个分区间使用”,”间隔 6)查看表中有多少分区 show partitions dept_partition; 1. 7)查看分区表结构 desc formatted dept_par...
as 带分区的表 create table log_no_partition as select * from log_partition where day='20210203'; -- 查看表结构, 会发现已经没有分区字段了 desc formatted log_no_partition; 增加分区 -- 查看分区 hive (default)> show partitions log_partition; OK partition day=20210201 day=20210202 day=20...
desc formatted dept_partition; 1. 二级分区 创建二级分区表 首先正常地创建一个表 create table dept_partition2( deptno int, dname string, loc string ) partitioned by (day string, hour string) row format delimited fields terminated by '\t'; 1. 2. 3. 4. 5. 加载数据到二级分区表中 load da...
showpartitions dept_partition;showpartitions dept;--不能查一个不是分区表的表descdept_partition;descformatted dept_partition; 删(对于外部表 只能删分区的元数据信息 hdfs文件夹会保留) altertabledept_partitiondroppartition(day='__HIVE_DEFAULT_PARTITION__')altertabledept_partitiondroppartition(day='20200405...
一旦这些统计信息收集完毕,可以通过DESCRIBE EXTENDED/FORMATTED语句查询统计信息,具体使用如下: -- 查看一个分区的统计信息 hive> DESCRIBE FORMATTED employee_partitioned PARTITION(year=2020, month=06); ... Partition Parameters: COLUMN_STATS_ACCURATE true numFiles 1 numRows 0 rawDataSize 0 totalSize 227 tr...
create table salary(employee_id string, employee_nm string, salary int) partitioned by (data_dt string);1.2 查看分区表的格式 desc formatted salary;1.3 向分区表插入数据：insert into salary partition(data_dt='2021-07-19') values ('10001','Eric',150000);insert into salary partition(data_...
hive> desc formatted dept_partition; 创建二级分区表 createtabledept_partition2( deptno int, dnamestring, locstring) partitioned by (monthstring, daystring) rowformatdelimited fields terminated by'\t'; 加载数据到二级分区表中 hive (default)>load datalocalinpath'/opt/module/datas/dept.txt'intotable...
SHOWCOLUMNS(FROM|IN)table_name[(FROM|IN)db_name];show columnsinstudent;--10、显示当前支持的所有自定义和内置的函数 show functions;--11、Describe desc--查看表信息 desc extended table_name;--查看表信息(格式化美观) desc formatted table_name;--查看数据库相关信息 describe database database_name;...
hive> desc formatted order_partition; [hadoop@hadoop001 data]$ hdfs dfs -ls hdfs://192.168.137.141:9000/user/hive/warehouse/ruozedata.db/order_partition [hadoop@hadoop001 data]$ hdfs dfs -ls hdfs://192.168.137.141:9000/user/hive/warehouse/ruozedata.db/order_partition/event_month=2014-05 ...
hive>desc formatted dept_partition; # Partition Information# col_name data_type commentmonthstring 2 、分区表注意事项 1)创建二级分区表 hive(default)>create tabledept_partition2(deptnoint,dnamestring,locstring)partitioned by(monthstring,daystring)row format delimited fields terminated by'\t'; ...