mysql中case
MySQL数据库中case表达式的用法示例
目录前言1. 简单 CASE 表达式 (Simple CASE)示例:根据成绩等级显示学生的评级2. 搜索 CASE 表达式 (Searched CASE)示例:根据学生的成绩区间判断等级3. CASE 表达式的常见应用3.1 在 SELECT 查询中使用&n[详细]
2025-03-27 11:00 分类:数据库Is it bad practice to use an enum that maps to some seed data in a Database?
I have a table in my database called \"OrderItemType\" which has about 5 records for the different OrderItemTypes in my system.Each OrderItem contains an OrderItemType, and this gives me re开发者_开发[详细]
2022-12-28 20:31 分类:问答