如何在从父表中删除记录时使用Postgresql查询中的级联

Question

我们如何在删除其他子表中引用的父表中的一条记录时使用PostgreSQL中的级联.目前它给出了语法错误.

ERROR:  syntax error at or near "cascade"
LINE 1: DELETE FROM fs_item where itemid = 700001803 cascade;

Answer 1

您必须以ON DELETE CASCADE下列方式添加约束:

ALTER TABLE table1 ADD CONSTRAINT "tbl1_tbl2_fkey" FOREIGN KEY(reference_key) REFERENCES table2 ON DELETE CASCADE;

然后,您只需执行DELETE查询即可

 DELETE FROM fs_item where itemid = 700001803