MYSQL DAY/DAYOFWEEK/DAYOFYEAR 日序函数族 迁移 tdsql boundless 怎么改

兼容性判定

怎么改

DAY/DAYOFMONTH -> extract(day)；DAYOFYEAR -> doy；DAYOFWEEK -> dow+1

判定说明

该目标库能力矩阵尚未建立此特征条目，支持情况待评估，建议 PoC 复核

库侧 / 应用侧路径

推荐路线：db_side。验证建议：周日/周一、闰年、年首尾、时间戳时区和 NULL 回归

规则样例

SELECT DAYOFWEEK(created_at) FROM orders

SELECT DAYOFYEAR(created_at) FROM orders

SELECT MONTH(created_at) FROM orders

参考来源

• https://cloud.tencent.com/document/product/1376/126608
• https://cloud.tencent.com/document/product/1376/126644
• https://github.com/darold/ora2pg/blob/97015451a4d1cfbee888f2e6efe7ff68c239a9b5/lib/Ora2Pg/PLSQL.pm#L3060-L3145
• https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html

相关改造点

• MYSQL → tdsql boundless 全部改造点
• tdsql boundless 兼容性总览
• MYSQL 迁移国产库总览
• MYSQL ALTER TABLE 增删主键限制 迁移 tdsql boundless 怎么改
• MYSQL AUTO_INCREMENT 自增列 迁移 tdsql boundless 怎么改
• MYSQL 表/列级 CHARSET 与 COLLATE 子句 迁移 tdsql boundless 怎么改
• MYSQL 列 DEFAULT 表达式兼容差异 迁移 tdsql boundless 怎么改
• MYSQL MySQL 降序索引列 迁移 tdsql boundless 怎么改
• MYSQL ENGINE= 存储引擎子句 迁移 tdsql boundless 怎么改