这一篇介绍主键关联的提速。主表订单表和子表明细表的关联就是主键关联。SQL 中，这种关联仍用 JOIN 实现，在两个表都很大的情况下，常常出现计算速度非常慢的现象。如果预先将主子表都按照主键有序存储，就可以使用归并算法实现关联。这种算法只需要对两个表依次遍历，不必借助外存缓存，可以大幅降低计算量和 IO 量。...

文章 2025-09-23 来自：开发者社区

第三篇 - 外键维表的关联：SPL轻量级文件存储提速查询实践

SQL 对关联的定义过于简单，就是两个表做笛卡尔积后再过滤，在语法上写成 A JOIN B ON …的形式。这样笼统处理多种关联，不体现关联运算本质，书写和优化都困难。 SPL 重新定义了关联。关联不再和笛卡尔积有关，而是分成两种情况：外键关联和主键关联。SPL 用不同的函数来计算不同的关联，体现关...

文章 2025-09-12 来自：开发者社区

第二篇 -COUNT DISTINCT：SPL轻量级文件存储提速查询实践

文章 2025-09-05 来自：开发者社区

第一篇 - 常规过滤及分组汇总：SPL轻量级文件存储提速查询实践

我们以订单表为例实现 esProc SPL 数据外置，提速常规过滤及分组汇总计算。我们使用 SPL 的 ETL 工具来生成脚本，实现数据的转储。在 [SPL 安装目录]\esProc\bin 找到 dft.exe，运行后选择文件 - 新建 ETL。打开工具 - 数据连接：点击连接后，数据库的表可以拖拽到工作区：双...

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更新时间 2025-10-24 10:09:45

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