Answered: Should you create an index? Why or why…

Should you create an index? Why or why not? SELECT P_CODE, P_PRICE FROM PRODUCT WHERE P_PRICE >= (SELECT AVG(P_PRICE) FROM PRODUCT);

A Guide to SQL

9th Edition

ISBN:9781111527273

Author:Philip J. Pratt

Publisher:Philip J. Pratt

Chapter7: Database Administration

Section: Chapter Questions

Problem 11RQ: How do you create an index? How do you create a unique index? What is the difference between an...

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Concept explainers

SQL Query

Structured Query Language is the full form of SQL. It is one of the standard languages to deal with the relational database. It is used to insert, update, delete, and search the records stored in a RDBMS. The relational databases are created and managed by using SQL.

Question

Should you create an index? Why or why not?

SELECT	P_CODE, P_PRICE
FROM	PRODUCT
WHERE	P_PRICE >= (SELECT AVG(P_PRICE) FROM PRODUCT);

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How do you create an index? How do you create a unique index? What is the difference between an index and a unique index?
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Use the following quert to answer the question below it: SELECT *FROM HSP_ACCT_CVG_LISTLEFT OUTER JOIN CLARITY_EMPON COVERAGE.PAYOR_ID = CLARITY_EMP.PAYOR_IDLEFT OUTER JOIN COVERAGEON HSP_ACCT_CVG_LIST.COVERAGE_ID = COVERAGE.COVERAGE_ID Why does this query fail to run?
SELECT P.BRAND_ID, B.BRAND_NAME, B.BRAND_TYPE,MAX(AVGPRICE) FROM LGPRODUCT P INNER JOIN LGBRAND B ON P.BRAND_ID = B.BRAND_ID (SELECT P.BRAND_ID, AVG (P.PROD_PRICE) AS AVGPRICE FROM LGPRODUCT P GROUP BY P.BRAND_ID)AS AVG_PRICE GROUP BY P.BRAND_ID, B.BRAND_NAME, B.BRAND_TYPE ERROR 1064 (42000) at line 1: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SELECT P.BRAND_ID, AVG (P.PROD_PRICE) AS AVGPRICE FROM LGPRODUCT P GROUP BY P.' at line 3
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An index is automatically created for a FOREIGN KEY constraint. Select one: a. True b. False
Create LessonSchedule table with FK constraints Two tables are created: Horse with columns: ID - integer, primary key RegisteredName - variable-length string Student with columns: ID - integer, primary key FirstName - variable-length string LastName - variable-length string Create the LessonSchedule table with columns: HorseID - integer with range 0 to 65 thousand, not NULL, partial primary key, foreign key references Horse(ID) StudentID - integer with range 0 to 65 thousand, foreign key references Student(ID) LessonDateTime - date/time, not NULL, partial primary key If a row is deleted from Horse, the rows with the same horse ID should be deleted from LessonSchedule automatically. If a row is deleted from Student, the same student IDs should be set to NULL in LessonSchedule automatically. Note: Table and column names are case sensitive in the auto-grader.

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