建表范例:支持update和delete
create table aaa( id string, visitor_name string ) clustered by(id) into 2 buckets stored as orc TBLPROPERTIES('transactional'='true');
目前只有ORCFileformat支持AcidOutputFormat,另外,建表时必须指定('transactional' = true)
2.alter table aaa set serdeproperties('serialization.null.format' = ''); -- 这个是设置null在hdfs里的处理方式
注意: stored as orc 的情况下,不能使用insert overwrite table,不支持。
create table if not exists aaa( id string, user_name string) row format delimited fields terminated by ' ' stored as textfile;
stored as textfile可以支持"insert overwrite table "
3.建表范例:textfile
create table if not exists user( id string comment 'openId', phone string comment '电话', user_name string comment '用户名', sex string comment '性别,直接存男女', certificate_no string comment '身份证', create_time string
) row format delimited fields terminated by ' ' NULL DEFINED AS '' stored as textfile;
附上 PARQUET 的压缩算法等设置