ORACLE SAMPLE 采样子句 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：case_by_case。验证建议：改 TABLESAMPLE SYSTEM/BERNOULLI（PG 系语法位置与百分比参数含义一致但关键字不同）；SAMPLE BLOCK 双参数/SEED 可重现采样的支持面需核对

规则样例

SELECT * FROM big_t SAMPLE (10)

SELECT COUNT(*) FROM big_t SAMPLE BLOCK (1) SEED (42)

SELECT * FROM big_t WHERE MOD(id, 10) = 0

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/SELECT.html