Five formulas, fewer clicks, and a lot less spreadsheet suffering.

排名函数是Sql Server2005新增的功能，下面简单介绍一下他们各自的用法和区别。我们新建一张Order表并添加一些初始数据方便我们查看效果。 row_number的用途的非常广泛，排序最好用他，一般可以用来实现web程序的分页，他会为查询出来的每一行记录生成一个序号 ...

大家好，我是田螺。 我们本文来看一道很经典的面试题：sharding-jdbc分页查询机制，如何避免深分页导致内存过大？ SELECT * FROM orders ORDER BY create_time DESC LIMIT 10000, 10 基本原理 根据配置的分片键（如 order_id 或 user_id）和分片算法，将这条 SQL 改写并路由到所有相关 ...

Hello there! 👋 I'm Luca, a BI Developer with a passion for all things data, Proficient in Python, SQL and Power BI ...

A seasoned software engineer with extensive experience in building complex distributed data-intensive backend services. The most general way to satisfy a COUNT DISTINCT or SELECT DISTINCT clause is to ...

To type numbers using the default keyboards on mobile devices, we usually have to hit ?123 (Android) or 123 (iPhone) to switch the layout. That’s a bit tedious, especially if you have to type numbers ...

When designing objects in SQL Server, we must follow certain best practices. For example, a table should have primary keys, identity columns, clustered and unclustered indexes, data integrity and ...

Microsoft Excel is a computer program that users across the globe use to calculate their spreadsheets or arrange their data. Excel provides over 300 functions that can assist individuals to make quick ...