A SQL Server-based e-commerce analytics project using the Brazilian Olist dataset to analyze sales, customers, products, sellers, delivery performance, and time-based business trends. The project was ...
Add support for scalar SQL functions (SQL UDFs) (1197) Add liquid clustering config for materialized views and streaming tables (thanks @reflection!) (1101) Add official support for insert_overwrite ...
原创 最新推荐文章于 2026-09-23 12:35:01 发布 · 225 阅读 简介:本资源是一份系统、详实的SQL Server入门级学习笔记,面向数据库 ...
DATEADD (day, 30, GETDATE ()) 是SQL Server特有语法,MySQL需改用 DATE_ADD (NOW (), INTERVAL 30 DAY) ; return_date IS NULL 确保只查未还记录,避免已还记录干扰; conn.setAutoCommit (false) 保证库存扣减与借阅记录插入原子性,防止出现“记录插入成功但库存没扣减”的脏数据。