From the weather.sql file posted in classwork, rewrite the following query to use joins instead of nested queries: SELECT * FROM forecasts f WHERE f.cid IN (SELECT c.cid FROM conditions c WHERE c.cname = 'Rain') AND f.lid IN (SELECT 1.lid FROM locations l WHERE 1.state = 'NY');

From the weather.sql file posted in classwork, rewrite the following query to use joins instead of nested queries: SELECT * FROM forecasts f WHERE f.cid IN (SELECT c.cid FROM conditions c WHERE c.cname = 'Rain') AND f.lid IN (SELECT 1.lid FROM locations l WHERE 1.state = 'NY');

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

Intermediate SQL Concepts

A query is a request for data or information from one or more database tables. This information could be presented in the form of pictorials, graphs, or complicated findings which helps in easy interpretation. Structured Query Language (SQL) is the most widely used programming language for retrieving and organizing data from relational databases. Collection of tables with rows and columns is referred to as a database. SQL is the language of databases. It makes it easier to extract specific data from databases, which can then be used for analysis.

Question

100%

From the weather.sql file posted in classwork, rewrite the following query to use joins instead of nested queries:
SELECT * FROM forecasts f
WHERE
f.cid IN (SELECT c.cid FROM conditions c
WHERE c .cname
'Rain')
AND
f.lid IN (SELECT l.lid FROM locations l
WHERE 1.state = ' NY');

Expert Solution

Step 1

select f.cid, f.lid from forecast f join conditions c join locations l
where
f.cid=c.cid and
f.lid=l.lid and
c.name='Rain' and
l.state='NY'

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