Database - Introduction to SQL
Exercise :: Introduction to SQL - True or False
11. |
Indexes can usually be created for both primary and secondary keys. |
Answer: Option A
Explanation:
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12. |
Each index consumes extra storage space and also requires overhead maintenance time whenever indexed data change value. |
Answer: Option A
Explanation:
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13. |
The HAVING clause acts like a WHERE clause, but it identifies groups that meet a criterion, rather than rows. |
Answer: Option A
Explanation:
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14. |
SQL is a data sublanguage. |
Answer: Option A
Explanation:
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15. |
The qualifier DISTINCT must be used in an SQL statement when we want to eliminate duplicate rows. |
Answer: Option A
Explanation:
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