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Database Fundamentals

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. A file containing a collection of compiled and optimized SQL statements that are available for future use






2. A relationship between two entities in which each occurrence of the first entity is related to many occurrences of the second entity and each occurrence of the second entity is related to or at most one occurrence of the first entity






3. A program or a collection of programs through which users interact with a database






4. The relational algebra command that combines tables and searches for rows in the first table that match all rows in the second table






5. When comparing tables an intersection is a new table containing all rows that are in both original tables






6. A data value meaning "unknown" or "not applicable"






7. A relational data manipulation language in which new tables are created from existing tables through the use of a set of operations






8. The SQL command that drops (deletes) and index from a table






9. A statement the can be either true or false. Also called a condition






10. The process of creating collections of records that share some common characteristics






11. An index built on more than one field






12. The combination of two or more rows in an operation - such as a join - or the combination of two or more columns for a primary key field to uniquely identify a given row in a table






13. A relational data manipulation language in which new tables are created from existing tables through the use of a set of operations






14. When comparing tables an intersection is a new table containing all rows that are in both original tables






15. Duplication of data or the storing of the same data in more than one place.






16. The field on which data are sorted






17. A structure that satisfies the properties required to be a relation with the exception of allowing repeating groups






18. When sorting on two fields this is the more important field






19. The SQL command used to describe the layout of a table. The word table is followed by the name of the table to be created and then by the names and data types of the column (fields) that comprise the table






20. The SQL command used to add new data to a table






21. A computer that provides services to the clients in a client/server system






22. A file used to store data about a single entity. Such a file can be thought of as a table.






23. Two tables are union compatible if they have the same number of fields and if their corresponding fields have identical data types






24. A structure that can store information about multiple types of entities - the attributes of these entities and the relationships among those entities






25. The process of determining the content and structure of data in a database in order to support some activity on behalf of a user or group of users






26. The part of an SQL SELECT command that indicates the condition rows must satisfy to be displayed in the query results






27. The process of determining the content and structure of data in a database in order to support some activity on behalf of a user or group of users






28. The portion of the system catalog that contains table information






29. A minimal collection of columns (attributes) in a table on which all columns are functionally dependent and that is chosen as the main direct-access vehicle to individual rows.






30. An association between entities






31. The query that is used to define the structure of a viewk






32. The SQL clause that is used in a CREATE TABLE or ALTER TABLE command to set a table's primary key field(s)






33. A field whose value is computed from other fields in the database






34. A very popular relational data definition and manipulation language that is used in many relational DBMS's






35. A Characteristic or property of an entity






36. In Access the query that updates the contents of a table






37. The table obtained by concatenating every row in the first table with every row in the second table






38. The relational algebra command for performing the difference of two tables






39. The prevention of unauthorized access to a database






40. A two-dimensional table-style collection of data in which all entries are single-valued - each column has a distinct name and all the values in a column are values of the attribute that is identified by the column name - and the order of the columns






41. The SQL command that creates an index in a table






42. The portion of the system catalog that contains index information






43. A statement the can be either true or false. Also called a condition






44. The property that lets you change the structure of a database without requiring you to change the programs that access the database






45. A characteristic or property of an entity






46. The column on which two tables are joined






47. When sorting on two fields this is the more important field






48. An index built on a single field






49. To indicate the table (relation) of which a given column (attribute) is a part by preceding the column name with the table name.






50. The individual who is responsible for a database or the head of database administration







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