hive窗口函数数据范围

window的内包括:

复制代码
(ROWS | RANGE) BETWEEN (UNBOUNDED | [num]) PRECEDING AND ([num] PRECEDING | CURRENT ROW | (UNBOUNDED | [num]) FOLLOWING)
(ROWS | RANGE) BETWEEN CURRENT ROW AND (CURRENT ROW | (UNBOUNDED | [num]) FOLLOWING)
(ROWS | RANGE) BETWEEN [num] FOLLOWING AND (UNBOUNDED | [num]) FOLLOWING

如何指定了order by,但是没有指定窗口,统计的数据是开始到当前行。

|---------------------------------------------------------------|
| SELECT a, SUM(b) OVER (PARTITION BY c ORDER BY d) FROM T; |

When ORDER BY is specified with missing WINDOW clause, the WINDOW specification defaults to RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW.

如果order by和 window都没有指定,那就是整个数据集

SELECT a, COUNT(b) OVER (PARTITION BY c, d)

FROM T;

When both ORDER BY and WINDOW clauses are missing, the WINDOW specification defaults to ROW BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING.

相关推荐
码字的字节1 天前
ZooKeeper在Hadoop中的协同应用:从NameNode选主到分布式锁实现
hadoop·分布式·zookeeper·分布式锁
liliangcsdn2 天前
mac测试ollama llamaindex
数据仓库·人工智能·prompt·llama
码字的字节2 天前
深入解析YARN中的FairScheduler与CapacityScheduler:资源分配策略的核心区别
hadoop·capacity·fairscheduler
Johny_Zhao2 天前
Centos8搭建hadoop高可用集群
linux·hadoop·python·网络安全·信息安全·云计算·shell·yum源·系统运维·itsm
晴天彩虹雨3 天前
统一调度与编排:构建自动化数据驱动平台
大数据·运维·数据仓库·自动化·big data·etl
码字的字节3 天前
深入解析Hadoop高频面试题:HDFS读/写流程的RPC调用链
hadoop·hdfs·rpc
白日与明月3 天前
Hive-vscode-snippets
hive·hadoop·vscode
Sirius Wu3 天前
Hive的窗口函数
数据仓库·hive·hadoop
码字的字节3 天前
深入解析HBase如何保证强一致性:WAL日志与MVCC机制
hadoop·hbase·wal·mvcc
シ風箏3 天前
Hive【安装 01】hive-3.1.2版本安装配置(含 mysql-connector-java-5.1.47.jar 网盘资源)
java·hive·mysql