網摘Say NO to Venn Diagrams When Explaining JOINs – Java, SQL and jOOQ.blog.jooq.org↗ Say NO to Venn Diagrams When Explaining JOINs – Java, SQL and jOOQ. https://blog.jooq.org/2016/07/05/say-no-to-venn-diagrams-when-explaining-joins/