Hive 分割槽的具體操作

建立乙個一級分割槽

create table if not exists day_part(

uid int,
uname string
)partitioned by (year int)
row format delimited
fields terminated by '\t'
;

load data local inpath '/root/day_part.txt' overwrite into table day_part partition (year=2017);

load data local inpath '/root/day_part.txt' into table day_part partition (year=2018);

show partitions day_part;

select * from day_part where year=2017; 查詢時指定分割槽，不必全表掃瞄

create table if not exists day_part1(

uid int,
uname string
)partitioned by (year int ,mouth int)
row format delimited 
fields terminated by '\t'
;

load data local inpath '/root/day_part.txt' overwrite into table day_part1 partition (year=2019,month=04);

load data local inpath '/root/day_part.txt' overwrite into table day_part1 partition (year=2019,month=03);

顯示分割槽

show partitions day_part1;

alter table day_part1 add partition(year=2017,month=1);

alter table day_part1 add partition(year=2017,month=2) partition(year=2017,month=3);

alter table day_part1 add partition(year=2017,month=10) location

"/user/hive/warehouse/buc1"

alter table day_part1 partition(year=2017,month=10) set location

"hdfs://mini1:9000/user/hive/warehouse/log_1"  ##路徑必須是絕對路徑。從hdfs://mini1:9000開始

alter table day_part1 drop partition (year=2017,month=1);

show partitions day_part1;

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