Statistics in Hive Statistics in Hive Motivation Scope Table and Partition Statistics Column Statistics Top K Statistics Implementation Usage Configuration Variables Newly Created Tables Existing Tables Examples Current Status (JIRA) This document de…

LanguageManual DML Hive Data Manipulation Language Hive Data Manipulation Language Loading files into tables Syntax Synopsis Notes Inserting data into Hive Tables from queries Syntax Synopsis Notes Dynamic Partition Inserts Example Additional Documen…

Describe Describe Database Describe Table/View/Column Display Column Statistics Describe Partition Describe Database Version information Icon As of Hive 0.7. DESCRIBE DATABASE [EXTENDED] db_name; DESCRIBE SCHEMA [EXTENDED] db_name;     -- (Note: Hive…

Status of Hive Authorization before Hive 0.13 SQL Standards Based Hive Authorization (New in Hive 0.13) Restrictions on Hive Commands and Statements Privileges Objects Object Ownership Users and Roles Names of Users and Roles Role Management Commands…

Subqueries in the FROM Clause Subqueries in the WHERE Clause Subqueries in the FROM Clause SELECT ... FROM (subquery) name ... SELECT ... FROM (subquery) AS name ...   (Note: Only valid starting with Hive 0.13.0) Hive supports subqueries only in the…

Join Optimization Join Optimization Improvements to the Hive Optimizer Star Join Optimization Star Schema Example Prior Support for MAPJOIN Limitations of Prior Implementation Enhancements for Star Joins Optimize Chains of Map Joins Current and Futur…

Archiving for File Count Reduction Note: Archiving should be considered an advanced command due to the caveats involved. Archiving for File Count Reduction Overview Settings Usage Archive Unarchive Cautions and Limitations Under the Hood Overview Due…

Hive Data Definition Language Hive Data Definition Language Overview Create/Drop/Alter Database Create/Drop/Truncate Table Alter Table/Partition/Column Create/Drop/Alter View Create/Drop/Alter Index Create/Drop Function Create/Drop/Grant/Revoke Roles…

Hive DDL(数据定义语言) Confluence Administrator创建, Janaki Lahorani修改于 2018年9月19日 原文链接 https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL 翻译:Google Google翻译,金山软件 金山词霸 校对:南大通用 范振勇 (2018.9.26) 一.概述 这里是HiveQL DDL语句的文档,其中包括: CREATE 数据库/SCHEMA,表…

环境 虚拟机:VMware 10 Linux版本:CentOS-6.5-x86_64 客户端:Xshell4 FTP:Xftp4 jdk8 hadoop-3.1.1 apache-hive-3.1.1 一.执行计划核心思想:把Hive SQL当做Mapreduce程序去优化以下SQL不会转为Mapreduce来执行 -select仅查询本表字段 -where仅对本表字段做条件过滤 Explain 显示执行计划:EXPLAIN [EXTENDED] query hive> explain sele…