update 名单 as m set 迟到次数=(selectcount(1) from 考勤表 as k where k.姓名=m.姓名 and k.是否迟到='迟到')
whereexists (select1from 考勤 as k where k.姓名=m.姓名 and k.是否迟到='迟到')
culuo4781的博客sql server 缓存 Whenever a query is run for the first time in SQL Server, it is compiled and a query plan is generated for the query. Every query requires a query plan before it is actually executed...
话数Science的博客 NTILE不支持ROWS BETWEEN,比如 NTILE(2) OVER(PARTITION BY cookieid ORDER BY createtime ROWS BETWEEN 3 PRECEDING AND CURRENT ROW) 参考:HiveSql面试题12--分桶问题(数据求前或后百分比问题)_sql分桶-CSDN...
高校知识店铺合集汇总的博客1. SQL Server 2016的常用版本有哪些?应用范围分别是什么? 答:SQL Server 2016提供了如下版本供不同应用进行选择: (1)企业版Enterprise(64位和32位):作为高级版本,SQL Server 2016Enterprise版提 供了...
culuo4781的博客 I recently did some research to analyze skewed data distribution in SQL Server. This article is the outcome of my analysis to share with SQL Server community. 我最近做了一些研究来分析S...
culuo4781的博客什么是SQL Server活动监视器? (What is SQL Server Activity Monitor?) SQL Server Activity Monitor is a feature in SQL Server Management Studio that displays information about the SQL Server processes ...
culuo4781的博客This articles gives you a performance comparison for NOT IN, SQL Not Exists, SQL LEFT JOIN and SQL EXCEPT. 本文为您提供了NOT IN,SQL Not Exists,SQL LEFT JOIN和SQL EXCEPT的性能比较。 The T-SQL...
culuo4781的博客介绍 (Introduction) 在上一篇有关introduction to SQL Server business intelligence we covered the general structure of an enterprise business intelligence solution. The tools needed to build these ...