11. ……………… defines rules regarding the values allowed in columns and is the standard mechanism for enforcing database integrity.
12. ……………….contains information that defines valid values that are stored in a column or data type.
13. The data in the database at a particular moment in time is called a ………………
14. ACID properties of transactions are
15. If several concurrent transactions are executed over the same data set and the second transaction updates the database before the first transaction is finished, the ____ property is violated and the database is no longer consistent.
16. An attribute is a(n):
17. Retrieval of data is done by using a………………
18. Which of the following is not a level of data abstraction?
19. In which ways two tables may be related:
20. A data dictionary is a repository that manages ………………
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