This is the actual database system. Your system must have at least the following items:

a$.3$ tables that are connected to each other, e$.$g$.$ table $1$ connects to table $2,$ and table $2$ connects to tabled $3.(20\text{'})$

b$.$ Abundant sample data records to simulate a real$-$world case. For instance, if you build a database for a doctor's office, you should have more patients than doctors $($in the DOCTOR table, you can have $5$ doctors, and in the PATIENT table, you can have $50$ patients$).(20\text{'})$

c$.5$ different types of queries reflecting routine tasks. $"5$ different types" means each query will use a different technique, e$.$g$.1$ query has a "where" clause, $1$ query uses "like", $1$ query uses "order by$",1$ query uses "distinct", $1$ query is a $"$j$"$ operation. If you use different built$-$in functions, they are considered same type of query, $-.$ g$.$ a query using "sum $0"$ and a query using "count$()"$ will be considered the same type, however, if a query uses both "sum$0"$ and "where", it will be considered a different type of query from a query using only "count$(0"$ because of the "where" clause. You can have more than $5$ queries and a same technique can appear in multiple queries, as long as there are $5$ queries where a unique technique can be found in each. $(20\text{'})$

d$.$ Correct relationship definition

E$.$ Show the tables, fields, and realtionship