作者：Jan Kowalik 13 年以前
380
shop
In a database system, the primary focus is on managing various entities and their relationships. Key entities include items, orders, and users, each with specific attributes such as IDs, names, and statuses.
作者：Jan Kowalik 13 年以前
380
更多类似内容
wykres
select data,count from order_pack where item-id = 'x' and data = 'last'
=> users.id
skala: 1-5
