三、create table ... stored as ... as select createtablebidata.dep_category_parquet_1as storedasparquetas select*frombidata.dep_category_copywheredepartment>0; WARNING: Hive-on-MRisdeprecatedinHive 2andmaynotbe availableinthe future versions. Consider using a different execution engine (i.e. s...
目标表不允许外部表create external table as select… 目标表会默认将存储格式设置为textfile格式,但是可以在sql中自己指定 create table 表名 row format delimited fields terminated by '\t' lines terminated by '\n' stored as orc tblproperties('orc.compression'='SNAPPY') as select 1. 2. 3. 4. 5...
stored as orc tblproperties("orc.compress"="ZLIB"); (2)插入数据 insert into log_orc_zlib select * from log_text; (3)查看插入后数据 hive (default)> dfs -du -h /user/hive/warehouse/log_orc_zlib/ ; 2.78 M /user/hive/warehouse/log_orc_none/000000_0 2)创建一个SNAPPY压缩的ORC存储方式...
最后,STORED AS ORC指定了将表存储为ORC格式。 在创建表之后,可以使用INSERT INTO语句将数据插入ORC表中: INSERT INTO table_name VALUES (value1, value2, ...); 在上面的语法中,table_name是要插入数据的表的名称,value1、value2等是要插入的实际值。 可以使用SELECT语句从ORC表中检索数据: SELECT * FROM...
[AS select_statement]; -- (Note: Available in Hive 0.5.0 and later; not supported for external tables) CREATE [TEMPORARY] [EXTERNAL] TABLE [IF NOT EXISTS] [db_name.]table_name LIKE existing_table_or_view_name [LOCATION hdfs_path]; ...
STORED AS TEXTFILE:数据格式,这里是text格式,也可以是其他格式如:TextFile、SequenceFile、RCFile、Avro、ORC、ParquetFile等。 location :外部表加载路径,内部表默认路径为:/user/hive/warehouse/dwd_database.db/table_name 2, create table ... as select ... 例如...
select videoId, category_name from gulivideo_orc lateral view explode(category) t_catetory as category_name) t1 group by t1.category_name order by hot desc limit 10; 3. 统计出视频观看数最高的20个视频的所属类别以及类别包含Top20视频的个数 ...
STORED AS orc;2.查看表结构 两种方式均可查看表结构：1.show create table table_name;2.desc table_name;3.重命名表名 语法：alter table old_table_name rename to new_table_name;实例：//将表名为test1的表修改其表名为test2 alter table test1 rename to test2;4.删除表 语法：drop table table_...
[AS select_statement]; -- (Note: Available in Hive 0.5.0 and later; not supported for external tables) CREATE [TEMPORARY] [EXTERNAL] TABLE [IF NOT EXISTS] [db_name.]table_name LIKE existing_table_or_view_name [LOCATION hdfs_path]; ...
当列很多或者数据量很大时,如果select *或者不指定分区,全列扫描和全表扫描效率都很低。 Hive中与列裁剪优化相关的配置项是hive.optimize.cp,与分区裁剪优化相关的则是hive.optimize.pruner,默认都是true。在HiveSQL解析阶段对应的则是ColumnPruner逻辑优化器。