Hive学习总结之三:HiveQL介绍DML

第二部分：DML

DML包含如下操作：

•向数据表内加载文件

•LOAD DATA [LOCAL] INPATH 'filepath' [OVERWRITE] INTO TABLE tablename [PARTITION (partcol1=val1, partcol2=val2 ...)]

Load 操作只是单纯的复制/移动操作，将数据文件移动到 Hive 表对应的位置。 filepath 1.相对路径，例如：project/data1 2.绝对路径，例如： /user/hive/project/data1 3.包含模式的完整 URI，例如：hdfs://namenode:9000/user/hive/project/data1

•将查询结果插入到Hive表中

基本模式	INSERT OVERWRITE TABLE tablename1 [PARTITION (partcol1=val1, partcol2=val2 ...)] select_statement1 FROM from_statement
多插入模式	FROM from_statement INSERT OVERWRITE TABLE tablename1 [PARTITION (partcol1=val1, partcol2=val2 ...)] select_statement1 [INSERT OVERWRITE TABLE tablename2 [PARTITION ...] select_statement2] ...
自动分区模式	INSERT OVERWRITE TABLE tablename PARTITION (partcol1[=val1], partcol2[=val2] ...) select_statement FROM from_statement
将查询结果写入HDFS文件系统	INSERT OVERWRITE [LOCAL] DIRECTORY directory1 SELECT ... FROM ... FROM from_statement INSERT OVERWRITE [LOCAL] DIRECTORY directory1 select_statement1 [INSERT OVERWRITE [LOCAL] DIRECTORY directory2 select_statement2]
INSERT INTO	INSERT INTO  TABLE tablename1 [PARTITION (partcol1=val1, partcol2=val2 ...)] select_statement1 FROM from_statement