A field in a table has the value NULL . This can mean the data is……

A composite primary key can be defined the CONSTRAINT phrase in which SQL commands?

Which of the following terms is synonymous with " tuple"?

All of the following are advantages of using a database , EXCEPT(trừ câu nào)?

A telephone number would be stories in a……. field in a database?

What element of database is a collection of data in row and column?

Which of the following functions does a database application program perform?

What must be installed along with SQL server 2000 so that web page developers can access data by using XPath query?

Which of the following is not a relationship type:

Data processed in a say that increases a user's knowledge is: