Put a tick if a sentence is right and a cross if it is wrong. Correct the wrong sentences. 1. Jim isn’t wanting an ice-cream. He doesn’t like it. 2. We’re enjoying the course very much. We are learning a lot. 3. I’m understanding you but I’m not agreeing with you. 4. Do you think that Vanessa plays golf well? 5. I’m sorry. I’m not knowing the answer. 6. I’m not believing you. You are telling lies! 7. They know the car costs a lot of money, but they want to buy it. 8. She listens to a French song but she doesn’t understand what it is meaning.
1. Further improvements are, however, needed, especially in areas of redundancy and data security.
2. Add a to primary key every database table to uniquely identify each record.
3. If reference is made to a primary key from another table, this is termed a foreign key.
4. A compound key is a key that consists of multiple columns, because one column is not sufficiently unique.
5. A special data structure that serves the processes of accessing relationship information by storing specific values that correspond to portions of the relationship content is the concept of a database index.
6. Referential integrity is a relational database concept, which states that table relationships must always be consistent.
7. MySQL is a very powerful program in its own right. It handles a large subset of the functionality of the most expensive and powerful database packages.
8. Software programmers are well acquainted with database concepts through relational databases like Oracle, SQL SERVER and MySQL, etc.
Объяснение:
Computers: blessing or a curse
Объяснение:
Computers play a significant role in the lives of modern people. Due to total computerization, the information flow has become super fast and effective. However, not all people view computers as a blessing because many aspects of computerization have fathered adverse outcomes currently existing in a global society.
First of all, with the help of computers, some confidential information from banks, healthcare, police, and other establishments is often under a high risk of being disclosed. Secondly, children prefer playing computer games to getting education. Thirdly, people have become vulnerable to personal information disclosure which has led to severe problems in their lives.
Computers are blessing because they help spread information fast but people must be careful as that information can harm if it goes to the wrong person.