SQL统计的相关内容

阿里云文档 2025-01-22

RDS SQL Server锁阻塞

本文介绍如何通过锁阻塞统计页面快速定位造成长时间阻塞的会话及其详细信息。

问答 2021-10-02 来自：开发者社区

SQL-请统计近7天每天到访的新用户数？

通过不同渠道拉新进来的用户，经过一段时间许多用户可能流水，而留下来的用户称之为留存用户。分析用户留存是拉新和用户运营的重要指标。假如我们有一张用户访问表：person_visit，记录了所有用户的访问信息，包含字段：用户id：user_id，访问时间：visit_date，访问页面：page_name，访问渠道（android,ios）：plat等请统计近7天每天到访的新用户数。

文章 2021-02-07 来自：开发者社区

让SQL优化器更准确！AnalyticDB PG版发布统计信息自动收集功能

作者：王伟（盏一）1. ADB PG 简介AnalyticDB for PostgreSQL是阿里云上的MPP数据仓库服务，其内核采用PostgreSQL引擎，支持标准SQL 2003，兼容PostgreSQL/Greenplum，高度兼容 Oracle 语法生态；具有存储计算分离，在线弹性平滑扩容的特点；既支持任意维度在线分析探索，也支持高性能离线数据处理；是面向互联网、金融、证券、保险、银行....

问答 2020-12-28 来自：开发者社区

使用Spark Streaming SQL进行 PV/UV统计的准备工作？

使用Spark Streaming SQL进行 PV/UV统计的准备工作？求大佬解答

问答 2020-12-28 来自：开发者社区

如何使用Spark Streaming SQL进行 PV/UV统计？

如何使用Spark Streaming SQL进行 PV/UV统计？求大佬解答

文章 2020-09-23 来自：开发者社区

技本功|统计信息对SQL执行效率的影响

在一个风和日丽的下午，奋哥哥突然接到业务方线上业务数据库CPU资源告警信息，立马放下手里的枸杞登录业务方阿里云控制台查看具体问题。对于数据库当前正在发生中的问题，我们首先从数据库实时会话信息中尝试抓取有效信息，可以看到该告警实例的会话已经出现堆积状态，大量会话处于"Sending data"状态且从TIME字段可以看到这些会话长时间执行未结束。会话长时间执行表示当前会话一直占用的数据库资源未释....

问答 2020-06-09 来自：开发者社区

查询所有的分类并且统计该分类的文章数SQL怎么写啊：报错

查询所有的分类并且统计该分类的文章数SQL怎么写啊 ---

问答 2020-05-13 来自：开发者社区

咨询一个flink sql的基础问题，如果要统计的数据（在kafka中）是那种嵌套多层的#Flink

咨询一个flink sql的基础问题，如果要统计的数据（在kafka中）是那种嵌套多层的json，能把想要的字段数据映射出来么？#Flink

问答 2020-04-24 来自：开发者社区

消息有个字段是数组格式需要统计数组中每个元素count 请教下这个sql 如何写？

问答 2020-03-31 来自：开发者社区

关心过业务系统里面的sql耗时吗？统计过慢查询吗？对慢查询都怎么优化过？

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云数据库SQL Server，具有企业许可授权，权限更为开放，引擎功能更为强大。能完美支持Windows平台的.NET架构，支持复杂SQL查询，性能优秀，并有强大的可视化管理工具，帮助您轻松管理数据。

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