建表範例:支援update和delete
create table aaa(id string
,visitor_name
string
)clustered by(id) into
2buckets
stored
as orc tblproperties('
transactional
'='true
');
目前只有orcfileformat支援acidoutputformat,另外,建表時必須指定('transactional' = true)
2.alter table aaa set serdeproperties('serialization.null.format' = ''); -- 這個是設定null在hdfs裡的處理方式
注意:stored as orc 的情況下,不能使用insert overwrite table,不支援。
create table if not exists aaa( id string, user_name string)row format delimited fields terminated by '\t
' stored as textfile;
stored as textfile可以支援"insert overwrite table "
3.建表範例:textfile
create table ifnot exists user(
id string comment '
openid',
phone
string comment '**'
, user_name
string comment '
使用者名稱'
, ***
string comment '
性別,直接存男女',
certificate_no
string comment '
身份證'
, create_time
string
)row format delimited fields terminated by '\t
' null defined as '' stored as textfile;
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