An enforced relationship ensures each value entered in a foreign key column matches an existing value in the related primary key column.
英
美
- 强制的关系确保在外键列中输入的每个值与相关主键列中的一个现有值匹配。
- 今日热词
-
- 深远海浮式风电平台 - deep-sea floating wind power platform
-
- 京雄高速公路 - Beijing-Xiongan expressway
-
- 农业及相关产业增加值 - the added value of agriculture and related industries