need Help explaining this SQL ============================================= --Retrieve the names of all cities and their corresponding weather descriptions based on "cityId" SELECT "name", "description" from "City" "c" INNER JOIN "weather" "w" ON "c"."cityId" = "w"."cityId"; --Retrieve the names of all cities and their corresponding temperatures based on "cityId" SELECT "name", "temp" from "City" "c" INNER JOIN "weather" "w" ON "c"."cityId" = "w"."cityId"; --Retrieve the names and timezones of all cities where the humidity is greater than 50%. SELECT "name", "timezone" from "City" "c" INNER JOIN "weather" "w" ON "c"."cityId" = "w"."cityId" WHERE "w"."humidity" > 50; --Retrieve the names and sunrise times of all cities where the temp is less than 20. SELECT "name", "sunrise" from "City" "c" INNER JOIN "weather" "w" ON "c"."cityId" = "w"."cityId" WHERE "w"."temp" < 20; --Retrieve the names and maximum temperatures of all cities where the wind speed is less than 10. SELECT "name", "tempMax" from "City" "c" INNER JOIN "weather" "w" ON "c"."cityId" = "w"."cityId" WHERE "w"."windSpeed" < 10;
need Help explaining this SQL ============================================= --Retrieve the names of all cities and their corresponding weather descriptions based on "cityId" SELECT "name", "description" from "City" "c" INNER JOIN "weather" "w" ON "c"."cityId" = "w"."cityId"; --Retrieve the names of all cities and their corresponding temperatures based on "cityId" SELECT "name", "temp" from "City" "c" INNER JOIN "weather" "w" ON "c"."cityId" = "w"."cityId"; --Retrieve the names and timezones of all cities where the humidity is greater than 50%. SELECT "name", "timezone" from "City" "c" INNER JOIN "weather" "w" ON "c"."cityId" = "w"."cityId" WHERE "w"."humidity" > 50; --Retrieve the names and sunrise times of all cities where the temp is less than 20. SELECT "name", "sunrise" from "City" "c" INNER JOIN "weather" "w" ON "c"."cityId" = "w"."cityId" WHERE "w"."temp" < 20; --Retrieve the names and maximum temperatures of all cities where the wind speed is less than 10. SELECT "name", "tempMax" from "City" "c" INNER JOIN "weather" "w" ON "c"."cityId" = "w"."cityId" WHERE "w"."windSpeed" < 10;
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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I need Help explaining this SQL
=============================================
--Retrieve the names of all cities and their corresponding weather descriptions based on "cityId"
SELECT "name", "description" from "City" "c" INNER JOIN "weather" "w" ON "c"."cityId" = "w"."cityId";
--Retrieve the names of all cities and their corresponding temperatures based on "cityId"
SELECT "name", "temp" from "City" "c" INNER JOIN "weather" "w" ON "c"."cityId" = "w"."cityId";
--Retrieve the names and timezones of all cities where the humidity is greater than 50%.
SELECT "name", "timezone" from "City" "c" INNER JOIN "weather" "w" ON "c"."cityId" = "w"."cityId"
WHERE "w"."humidity" > 50;
--Retrieve the names and sunrise times of all cities where the temp is less than 20.
SELECT "name", "sunrise" from "City" "c" INNER JOIN "weather" "w" ON "c"."cityId" = "w"."cityId"
WHERE "w"."temp" < 20;
--Retrieve the names and maximum temperatures of all cities where the wind speed is less than 10.
SELECT "name", "tempMax" from "City" "c" INNER JOIN "weather" "w" ON "c"."cityId" = "w"."cityId"
WHERE "w"."windSpeed" < 10;
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