Q4: Consider the following MAILORDER relational schema describing the data for a mail ordercompany. (Choose five only).PARTS(Pno, Pname, Qoh, Price, Olevel)CUSTOMERS(Cno, Cname, Street, Zip, Phone)EMPLOYEES(Eno, Ename, Zip, Hdate)ZIP CODES(Zip, City)ORDERS(Ono, Cno, Eno, Received, Shipped)ODETAILS(Ono, Pno, Qty)(10 Marks)I want a detailed explanation tounderstand the mechanism how it isQoh stands for quantity on hand: the other attribute names are self-explanatory. Specify andexecute the following queries using the RA interpreter on the MAILORDER database schema.a. Retrieve the names of parts that cost less than $20.00.b. Retrieve the names and cities of employees who have taken orders for parts costing more than$50.00.c. Retrieve the pairs of customer number values of customers who live in the same ZIP Code.d. Retrieve the names of customers who have ordered parts from employees living in Wichita.e. Retrieve the names of customers who have ordered parts costing less than$20.00.f. Retrieve the names of customers who have not placed an order.g. Retrieve the names of customers who have placed exactly two orders.

I have explained each query's and mechanism and how I have arrived on the solution : 1. Retrieve the…

Answered: Q4: Consider the following MAILORDER…

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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Also Draw Schema Diagram
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THIS IS A PROBLEM IN MYSQL. PLEASE ANSWER CORRECTLY. OUR MY SQL IS RUN USING COMMAND LINE

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