ORACLE KEEP (DENSE_RANK FIRST/LAST) 聚合子句 迁移 gbase 8s 怎么改

兼容性判定

怎么改

需按命中位置逐条评估改写

判定说明

能力矩阵暂未声明该特征，按未覆盖处理并降低置信度，建议 PoC 复核

库侧 / 应用侧路径

推荐路线：app_side。验证建议：并列第一（tie）用例必测：KEEP 聚合与窗口取单行的结果差异

规则样例

SELECT MAX(sal) KEEP (DENSE_RANK FIRST ORDER BY hire_date) FROM emp

SELECT dept, MIN(sal) KEEP (DENSE_RANK LAST ORDER BY ver) FROM emp GROUP BY dept

SELECT DENSE_RANK() OVER (ORDER BY sal) FROM emp

参考来源

• https://www.gbase.cn/docs/gbase-8s/05%20%E6%95%B0%E6%8D%AE%E5%BA%93%E5%BC%80%E5%8F%91/03%20SQL%E6%8C%87%E5%8D%97%E8%AF%AD%E6%B3%95/
• https://docs.gbasedbt.com/gbase8s/
• https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/FIRST.html