PSQL queryPlease explain thank you!! Connect to the world database.Query the city table.Part 1) Write a query to sum up city populations and organize rows by the 2nd letter of the city's country code. Include a count of countriesrepresented by each row. Label results to exactly match the below query:country_code_middle_letterI total populationNZYO > RE0VWLZMMDEGBUXTMPHHDEKSA(25 rows)136512318 |9556366 I102877005 I2139257 I37936243817023091149521028380 17213220518 I6420266424 I6812955315 I 4344925343 I 108123677350 I37457382033 I14627352714 I896490201 |26700 |122782784 |841147304 |579198118 I 255country_count7742928 I228448180 I 557HANNOM29123630527 I 32183561900 I26336832 I100166757 I87929719 I 23272364Part 2) There are 26 letters in the alphabet. Why does this query not return 26 rows?

Write a query to sum up city populations and organize rows by the 2nd letter of the city's country…

Answered: PSQL query Please explain thank you!!

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PSQL query Please explain thank you!!

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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Question

PSQL query

Please explain thank you!!

Connect to the world database.
Query the city table.
Part 1) Write a query to sum up city populations and organize rows by the 2nd letter of the city's country code. Include a count of countries
represented by each row. Label results to exactly match the below query:
country_code_middle_letter
I total population
N
ZYO > RE
0
V
W
L
Z
M
MDEGBUXTMPHHDEKSA
(25 rows)
136512318 |
9556366 I
102877005 I
2139257 I
379
36
243
8
170230911
495
21028380 1
72
13220518 I
64
20266424 I
68
12955315 I 43
44925343 I 108
123677350 I
374
57382033 I
146
27352714 I
89
6490201 |
26
700 |
1
22782784 |
84
1147304 |
5
79198118 I 255
country_count
7742928 I
228448180 I 557
HANNOM
29
123630527 I 321
8
3561900 I
26336832 I
100166757 I
87929719 I 232
72
364
Part 2) There are 26 letters in the alphabet. Why does this query not return 26 rows?

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