city (SELECT city FROM employee WHERE reports_to = 2); 2. SELECT customer.* FROM customer INNER JOIN employee ON customer.city employee.city WHERE reports_to= 2; Query #1 would be more efficient as it is based on primary and foreign keys. O Query #1 would be more efficient as it is not using indexed columns. Both would be the same as both use the same indices for the join and filter. Query #2 would be more efficient as it is based on primary and foreign keys.

city (SELECT city FROM employee WHERE reports_to = 2); 2. SELECT customer.* FROM customer INNER JOIN employee ON customer.city employee.city WHERE reports_to= 2; Query #1 would be more efficient as it is based on primary and foreign keys. O Query #1 would be more efficient as it is not using indexed columns. Both would be the same as both use the same indices for the join and filter. Query #2 would be more efficient as it is based on primary and foreign keys.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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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

FROM customer
WHERE city IN
(SELECT city
FROM employee
WHERE reports_to= 2);
2. SELECT customer.*
FROM customer
INNER JOIN employee
ON customer.city = employee.city
WHERE reports_to = 2;
Query #1 would be more efficient as it is based on primary and foreign
keys.
O Query #1 would be more efficient as it is not using indexed columns.
Both would be the same as both use the same indices for the join and
filter.
Query #2 would be more efficient as it is based on primary and foreign
keys.
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