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7: Querying SQL Data
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1. Which clauses in a SELECT statement are part of the table expression A. SELECT B. FROM C. WHERE D. ORDER BY B and C are the correct answers. 2. In what order are the clauses of a SELECT statement applied The clauses are applied in the following order: FROM, WHERE, GROUP BY, HAVING, SELECT, and ORDER BY. 3. You are writing a SELECT statement that retrieves the CD_TITLE column and all rows from the INVENTORY table. Which SELECT statement should you use You should use the following SQL statement: SELECT CD_TITLE FROM INVENTORY; 4. You are writing a SELECT statement that retrieves the CD_TITLE column and all rows from the INVENTORY table. You want the column in the query results to be named COMPACT_ DISC. Which SELECT statement should you use
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Appendix A:
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Answers to Self Test
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You should use the following SQL statement: SELECT CD_TITLE AS COMPACT_DISC FROM INVENTORY; 5. Which clauses in a SELECT statement are required A. SELECT B. FROM C. WHERE D. GROUP BY A and B are the correct answers. 6. Which keyword should you add to the SELECT clause to ensure that each row of the query result is unique A. ALL B. ROLLUP C. DISTINCT D. CUBE C is the correct answer. 7. You re creating a SELECT statement for the INVENTORY table and you want to ensure that only rows with a RETAIL_PRICE value of less than $16.00 are included in the query results. What WHERE clause should you use You should use the following WHERE clause: WHERE RETAIL_PRICE < 16.00 8. You re creating a SELECT statement that includes a WHERE clause. The WHERE
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clause contains two predicates. You want the condition of either one of the predicates to be met, but it s not necessary for both conditions to be met. What keyword should you use to connect the two predicates
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OR 9. Each predicate in a WHERE clause is evaluated to which of the following A. True B. Not C. False D. Unknown A, C, and D are the correct answers.
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10. Which clause allows you to group together values in a specified column A. ROLLUP B. HAVING C. ORDER BY D. GROUP BY D is the correct answer. 11. Which two operators can you use in a GROUP BY clause to return additional summary data in a query result A. ROLLUP B. HAVING C. CUBE D. DISTINCT A and C are the correct answers. 12. You re writing a SELECT statement that retrieves the CATEGORY and PRICE columns from the COMPACT_DISC_STOCK table. You want to group data together first by the CATEGORY column and then by the PRICE column. Which SELECT statement should you use You should use the following SQL statement: SELECT CATEGORY, PRICE FROM COMPACT_DISC_STOCK GROUP BY CATEGORY, PRICE; 13. You re writing a SELECT statement that retrieves the CATEGORY and PRICE
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columns from the COMPACT_DISC_STOCK table. You want to group together data first by the CATEGORY column and then by the PRICE column. You then want to filter out any groups that have a PRICE value over 15.99. Which SELECT statement should you use
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You should use the following SQL statement: SELECT FROM GROUP HAVING CATEGORY, PRICE COMPACT_DISC_STOCK BY CATEGORY, PRICE PRICE < 16.00;
14. You re creating a SELECT statement that includes a SELECT clause, FROM clause, WHERE clause, GROUP BY clause, and HAVING clause. From which clause will the HAVING clause receive output A. SELECT B. FROM
Appendix A:
Answers to Self Test
C. WHERE D. GROUP BY D is the correct answer. 15. How does the HAVING clause differ from the WHERE clause The HAVING clause is similar to the WHERE clause in that it defines a search condition. However, unlike the WHERE clause, the HAVING clause is concerned with groups, not individual rows. 16. From which clause does the ORDER BY clause receive output The SELECT clause 17. Which keyword should you add to an ORDER BY clause to sort data in descending order DESC
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