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SQL: A Beginner s Guide
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9: Using Predicates
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1. In which SELECT statement clause do you include predicates WHERE clause 2. Which comparison operator symbol should you use to express a not equal condition A. <= B. >= C. <> D. =< C is the correct answer. 3. Which keywords can you use to combine predicates in a WHERE clause The AND keyword and the OR keyword 4. You want to query a table that includes the PRICE column. You want to ensure that all rows returned have a PRICE value of 13.99. What predicate should you use PRICE = 13.99 5. You create the following SQL statement: SELECT FROM WHERE AND CD_TITLE, RETAIL_PRICE CDS_ON_HAND RETAIL_PRICE >= 14 RETAIL_PRICE <= 16;
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What predicate can you use in place of the two predicates shown in this statement RETAIL_PRICE BETWEEN 14 AND 16 6. What keyword can you add to a BETWEEN predicate to find the inverse of the condition specified by the predicate NOT 7. When is a null value used in a column A null value is used in place of a value when that value is undefined or not known. A null indicates that the value is absent. This is not the same as a zero, a blank, or a default value. 8. You want to query a table to determine which values are null. What type of predicate should you use NULL predicate 9. You re creating a SELECT statement that queries the ARTISTS_BIO table. You want to return all columns in the table, but you want to return only those rows that do not contain null values in the PLACE_OF_BIRTH column. 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 * FROM ARTISTS_BIO WHERE PLACE_OF_BIRTH IS NOT NULL; 10. You re querying the CD_INVENTORY table. You want to view all columns, but you want to view only rows that contain the word Christmas in the name of the CD. The names are stored in the CD_TITLE column. Which SELECT statement should you use You should use the following SQL statement: SELECT * FROM CD_INVENTORY WHERE CD_TITLE LIKE ('%Christmas%'); 11. What is the difference between a percentage sign and an underscore when used in a LIKE predicate The percentage sign represents zero or more unknown characters, and the underscore represents exactly one unknown character. 12. What two types of data sources can you use in an IN predicate A defined list or a subquery 13. Which type of predicate is concerned only with determining whether or not a subquery returns any rows EXISTS predicate 14. What column names must be specified in an EXISTS predicate It does not matter what columns or how many columns you specify in the SELECT clause of the subquery in an EXISTS predicate. This type of predicate is concerned only with whether rows are being returned, not with the content of those rows. You can specify any column names or just an asterisk. 15. You re creating a SELECT statement that includes a predicate in the WHERE clause. You want to use a comparison operator to compare the values in one of the columns to the results of a subquery. You want the predicate to evaluate to true for any of the subquery results. Which type of predicate should you use A. EXISTS B. ANY C. ALL D. IN B is the correct answer. 16. What is the difference between a SOME predicate and an ANY predicate There is no difference. The two predicates return identical results.
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SQL: A Beginner s Guide
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17. How does the ALL predicate differ from the SOME predicate In many respects, the ALL predicate works the same way as the SOME predicate. The ALL predicate compares column values to the subquery results. However, rather than the column values having to evaluate to true for any of the result values, the column values must evaluate to true for all the result values; otherwise, the row is not returned.
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