Question: can you lower the query cost for this query. SELECT customer.customer _ id , COUNT ( rental . rental _ id ) AS num _

can you lower the query cost for this query. SELECT customer.customer_id, COUNT(rental.rental_id) AS num_rentals
FROM customer
LEFT JOIN rental ON customer.customer_id = rental.customer_id
GROUP BY customer.customer_id;

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer
Step: 1 Unlock blur-text-image
Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock
Step: 3 Unlock

Students Have Also Explored These Related Databases Questions!

Q:

Here is the schema: -- Sakila Sample Database Schema -- Version 1.0 -- Copyright (c) 2006, 2015, Oracle and/or its affiliates. -- All rights reserved. -- Redistribution and use in source and binary...

Q:

Question: Build a SELECT that lists the unique rental rates across all films. Expected Result Set Size: 3 Rows Here is the schema used: -- Sakila Sample Database Schema -- Version 1.0 -- Copyright...

Q:

create database AutoRentals go use AutoRentals go create table Customer (CID integer, CName varchar(20), Age integer, Resid_City varchar(20), BirthPlace varchar(20), Constraint PK_Customer Primary...

Q:

I have problems understanding this case study for database. can someone help me solve this. Deliverables: 1. Create a list with the main business rules 2. Identify the main Entity types and their...

Q:

(a) In the tblCustomerstable, set the validation rule of the RoomNumberfield to be between 100 and 999. Set validation text to "Room number can only have three digits". Please also add an input mask...

Q:

MIS Management Information System Please answer by filling this table, Thanks! Query Question Answer 1 2 3 4 5 6 7 H film film_id title description release_year language_id original_language...

Q:

Instructions: Prepare and execute each of the queries listed using the " sakila" database in MySQL . Use the schema shown below. When all of your queries are complete, follow the instructions below...

Q:

Instructions: Prepare and execute each of the queries listed using the " sakila" database in MySQL . Use the schema shown below. When all of your queries are complete, follow the instructions below...

Q:

Management info system (MIS) If you only find the query that's fine I will run it and find the answer. Thanks !! Please answer by filling this table If you only find the query that's fine I will run...

Q:

Instructions: Prepare And Execute Each Of The Queries ... Your question has been answered Let us know if you got a helpful answer. Rate this answer Question: Instructions: Prepare and execute each of...

Q:

Write the Python code that defines a class called Vehicle , which will have a maximum occupancy of 8 . The vehicle should be initialized with the number of occupants. If the number of occupants...

Q:

Whenever the population has a normal probability distribution, the sampling distribution of the mean is a normal probability distribution for: a. only large sample sizes. b. only small sample sizes....

Q:

[ Related to Solved Problem 9 . 2 ] A reader wrote to an advice column in the New York Times complaining that his insurance company canceled his homeowner's policy after he had filed two claims. The...

Q:

Compared with half a century ago, adoption has become _ _ _ _ _ _ _ _ _ common, but it is more open and acceptabl e , so we probably discuss it _ _ _ _ _ _ _ . fill in the blanks more or much less or...

Q:

Go to www.workingmother.com/best-companies. Review any five of the 100 Best Companies 2020 Winners. What practices do they use to help employees achieve a work-life and work-family balance? What...

Q:

How will the increased automation of work influence jobs and the skills employees need to perform those jobs?

Q:

Go to www.troopstoenergyjobs.com/about, a website created by the Center for Energy Workforce Development to help military veterans transition to a career in the energy industry. Click on Roadmap....