如何在SQL中实现ER图中显示的客户和客户表 [英]How can I implement the customer and Account table shown in ER diagram in SQL
如何不使用工具就仅凭数据为数据库创建ER图? [英]How can I create an ER diagram for a database from the data alone without using a tool?
在ER图中,我们如何表示某种关系,例如某些球员是教练还是某些学生是老师 [英]In ER Diagram how can we represent a relation like some players are coaches or some students are teachers