From 6bb11daa70d3236a3a958965c5ee15ac0b06969c Mon Sep 17 00:00:00 2001
From: Vikas Kumar <12.vikaskumar99@gmail.com>
Date: Thu, 7 Oct 2021 00:05:11 +0530
Subject: [PATCH 01/20] Revising Aggregations - The Count Function.pgsql

---
 Revising Aggregations - The Count Function.pgsql | 3 +++
 1 file changed, 3 insertions(+)
 create mode 100644 Revising Aggregations - The Count Function.pgsql

diff --git a/Revising Aggregations - The Count Function.pgsql b/Revising Aggregations - The Count Function.pgsql
new file mode 100644
index 0000000..9c98b17
--- /dev/null
+++ b/Revising Aggregations - The Count Function.pgsql	
@@ -0,0 +1,3 @@
+select count(Population)
+from CITY 
+where Population>100000;

From 769de1401cae8363d659bf17665e18bca8188c1a Mon Sep 17 00:00:00 2001
From: Vikas Kumar <12.vikaskumar99@gmail.com>
Date: Thu, 7 Oct 2021 00:06:44 +0530
Subject: [PATCH 02/20] Average Population.pgsql

---
 Average Population.pgsql | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 Average Population.pgsql

diff --git a/Average Population.pgsql b/Average Population.pgsql
new file mode 100644
index 0000000..6c26722
--- /dev/null
+++ b/Average Population.pgsql	
@@ -0,0 +1,2 @@
+select floor (avg(population))
+from city ;

From ad66a38874df0e17c93046a536b1412ed93cc44c Mon Sep 17 00:00:00 2001
From: Vikas Kumar <12.vikaskumar99@gmail.com>
Date: Thu, 7 Oct 2021 00:07:54 +0530
Subject: [PATCH 03/20] Create Japanese Cities' Names.pgsql

---
 Japanese Cities' Names.pgsql | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 Japanese Cities' Names.pgsql

diff --git a/Japanese Cities' Names.pgsql b/Japanese Cities' Names.pgsql
new file mode 100644
index 0000000..460d53e
--- /dev/null
+++ b/Japanese Cities' Names.pgsql	
@@ -0,0 +1,10 @@
+
+/*
+    Enter your query here and follow these instructions:
+    1. Please append a semicolon ";" at the end of the query and enter your query in a single line to avoid error.
+    2. The AS keyword causes errors, so follow this convention: "Select t.Field From table1 t" instead of "select t.Field From table1 AS t"
+    3. Type your code immediately after comment. Don't leave any blank line.
+*/
+SELECT NAME 
+FROM CITY 
+WHERE COUNTRYCODE = 'JPN';

From f402913cdb23be6d250f24ca42e448206bd12b24 Mon Sep 17 00:00:00 2001
From: Vikas Kumar <12.vikaskumar99@gmail.com>
Date: Thu, 7 Oct 2021 00:08:50 +0530
Subject: [PATCH 04/20] Create Weather Observation Station 12.pgsql

---
 Weather Observation Station 12.pgsql | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 Weather Observation Station 12.pgsql

diff --git a/Weather Observation Station 12.pgsql b/Weather Observation Station 12.pgsql
new file mode 100644
index 0000000..dd52f29
--- /dev/null
+++ b/Weather Observation Station 12.pgsql	
@@ -0,0 +1,6 @@
+/*
+Enter your query here.
+*/
+select distinct city
+from station
+where city regexp '^[^aeiou].*[^aeiou]$';

From 3020f983119f873d38f190518e9331cabb543056 Mon Sep 17 00:00:00 2001
From: Vikas Kumar <12.vikaskumar99@gmail.com>
Date: Thu, 7 Oct 2021 00:10:58 +0530
Subject: [PATCH 05/20] Rename Revising the Select Query I.txt to Revising the
 Select Query.pgsql

---
 ...ng the Select Query I.txt => Revising the Select Query.pgsql | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 rename Revising the Select Query I.txt => Revising the Select Query.pgsql (65%)

diff --git a/Revising the Select Query I.txt b/Revising the Select Query.pgsql
similarity index 65%
rename from Revising the Select Query I.txt
rename to Revising the Select Query.pgsql
index 855bb06..2ec931f 100644
--- a/Revising the Select Query I.txt	
+++ b/Revising the Select Query.pgsql	
@@ -1,3 +1,3 @@
 SELECT * FROM City
 WHERE CountryCode ='USA'
-AND POPULATION>100000;
\ No newline at end of file
+AND POPULATION>100000;

From 71e60c71c307e883987c71b01f46ce3b9f05e3e9 Mon Sep 17 00:00:00 2001
From: Sahastra Kishore <52572171+Sahastracookcoder1@users.noreply.github.com>
Date: Thu, 7 Oct 2021 00:11:33 +0530
Subject: [PATCH 06/20] Create Weather Observation Station 18.pgsql

---
 Weather Observation Station 18.pgsql | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 Weather Observation Station 18.pgsql

diff --git a/Weather Observation Station 18.pgsql b/Weather Observation Station 18.pgsql
new file mode 100644
index 0000000..2ffd5e6
--- /dev/null
+++ b/Weather Observation Station 18.pgsql	
@@ -0,0 +1 @@
+select round((max(lat_n)-min(lat_n))+(max(long_w)-min(long_w)),4) from station;

From 46e0075b093701710852023ab71eb049763bc7a6 Mon Sep 17 00:00:00 2001
From: Vikas Kumar <12.vikaskumar99@gmail.com>
Date: Thu, 7 Oct 2021 00:11:45 +0530
Subject: [PATCH 07/20] Rename Top Earners.txt to Top Earners.pgsql

---
 Top Earners.txt => Top Earners.pgsql | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 rename Top Earners.txt => Top Earners.pgsql (100%)

diff --git a/Top Earners.txt b/Top Earners.pgsql
similarity index 100%
rename from Top Earners.txt
rename to Top Earners.pgsql

From 5a91716d893880b6b190363b99a7c0de648a401c Mon Sep 17 00:00:00 2001
From: Vikas Kumar <12.vikaskumar99@gmail.com>
Date: Thu, 7 Oct 2021 00:13:09 +0530
Subject: [PATCH 08/20] Rename Revising the Select Query II.txt to Revising the
 Select Query II.pgsql

---
 ...he Select Query II.txt => Revising the Select Query II.pgsql | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 rename Revising the Select Query II.txt => Revising the Select Query II.pgsql (65%)

diff --git a/Revising the Select Query II.txt b/Revising the Select Query II.pgsql
similarity index 65%
rename from Revising the Select Query II.txt
rename to Revising the Select Query II.pgsql
index 7f4e661..f187c3a 100644
--- a/Revising the Select Query II.txt	
+++ b/Revising the Select Query II.pgsql	
@@ -1,3 +1,3 @@
 SELECT NAME FROM CITY
 WHERE COUNTRYCODE='USA'
-AND POPULATION>=120000;
\ No newline at end of file
+AND POPULATION>=120000;

From aa1b3391c3f886aef4c95a9cf4438bd8f6c42e61 Mon Sep 17 00:00:00 2001
From: Sahastra Kishore <52572171+Sahastracookcoder1@users.noreply.github.com>
Date: Thu, 7 Oct 2021 00:14:04 +0530
Subject: [PATCH 09/20] Create Higher Than 75 Marks.pgsql

---
 Higher Than 75 Marks.pgsql | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 Higher Than 75 Marks.pgsql

diff --git a/Higher Than 75 Marks.pgsql b/Higher Than 75 Marks.pgsql
new file mode 100644
index 0000000..719e442
--- /dev/null
+++ b/Higher Than 75 Marks.pgsql	
@@ -0,0 +1 @@
+SELECT NAME FROM STUDENTS WHERE MARKS>75 ORDER BY RIGHT(NAME,3),ID ASC;

From aaf263d985ad6abc60b4dc68a813c7cf2e86fac7 Mon Sep 17 00:00:00 2001
From: Sahastra Kishore <52572171+Sahastracookcoder1@users.noreply.github.com>
Date: Thu, 7 Oct 2021 00:15:37 +0530
Subject: [PATCH 10/20] Create Type of Triangle.pgsql

---
 Type of Triangle.pgsql | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 Type of Triangle.pgsql

diff --git a/Type of Triangle.pgsql b/Type of Triangle.pgsql
new file mode 100644
index 0000000..529b39a
--- /dev/null
+++ b/Type of Triangle.pgsql	
@@ -0,0 +1,11 @@
+SELECT CASE 
+WHEN A+B>C AND A+C>B AND B+C>A THEN
+CASE
+WHEN A=B AND A=C THEN 'Equilateral'
+WHEN A=B OR B=C OR A=C THEN 'Isosceles'
+ELSE 'Scalene'
+END
+
+ELSE 'Not A Triangle'
+END 
+FROM TRIANGLES;

From a8618dc12ee99fedfa091e340bd27cdece05cd07 Mon Sep 17 00:00:00 2001
From: Sahastra Kishore <52572171+Sahastracookcoder1@users.noreply.github.com>
Date: Thu, 7 Oct 2021 00:18:05 +0530
Subject: [PATCH 11/20] Create African Cities.pgsql

---
 African Cities.pgsql | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 African Cities.pgsql

diff --git a/African Cities.pgsql b/African Cities.pgsql
new file mode 100644
index 0000000..1dcebae
--- /dev/null
+++ b/African Cities.pgsql	
@@ -0,0 +1 @@
+SELECT city.NAME FROM CITY INNER JOIN country on CITY.COUNTRYCODE=COUNTRY.CODE WHERE COUNTRY.CONTINENT='Africa';

From ec5cb05c64bb82c99996e9dd802ba8e4fc5d9b32 Mon Sep 17 00:00:00 2001
From: Harsh Tyagi <48311361+HarshTyagi007@users.noreply.github.com>
Date: Thu, 7 Oct 2021 12:17:52 +0530
Subject: [PATCH 12/20] Create Revising Aggregations.pgsql

---
 Revising Aggregations.pgsql | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 Revising Aggregations.pgsql

diff --git a/Revising Aggregations.pgsql b/Revising Aggregations.pgsql
new file mode 100644
index 0000000..5e7389c
--- /dev/null
+++ b/Revising Aggregations.pgsql	
@@ -0,0 +1,2 @@
+--https://www.hackerrank.com/challenges/revising-aggregations-sum/problem
+select sum(population) from city where district="California" ;

From 51923c34007518704af62fb8f5b98644ed4fe4bc Mon Sep 17 00:00:00 2001
From: Harsh Tyagi <48311361+HarshTyagi007@users.noreply.github.com>
Date: Thu, 7 Oct 2021 12:21:27 +0530
Subject: [PATCH 13/20] Create The PADS.pgsql

---
 The PADS.pgsql | 3 +++
 1 file changed, 3 insertions(+)
 create mode 100644 The PADS.pgsql

diff --git a/The PADS.pgsql b/The PADS.pgsql
new file mode 100644
index 0000000..bf533a7
--- /dev/null
+++ b/The PADS.pgsql	
@@ -0,0 +1,3 @@
+--https://www.hackerrank.com/challenges/the-pads/problem
+select concat(name,'(',left(OCCUPATION,1),')') from OCCUPATIONS order by name;
+select concat('There are a total of ',count(OCCUPATION),' ',lower(OCCUPATION),'s.') from OCCUPATIONS group by OCCUPATION order by count(OCCUPATION);

From 8ecfb69d26e06feb487cdc2816740d6918f8402c Mon Sep 17 00:00:00 2001
From: Harsh Tyagi <48311361+HarshTyagi007@users.noreply.github.com>
Date: Thu, 7 Oct 2021 12:26:28 +0530
Subject: [PATCH 14/20] Create Weather Observation Station 5.pgsql

---
 Weather Observation Station 5.pgsql | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 Weather Observation Station 5.pgsql

diff --git a/Weather Observation Station 5.pgsql b/Weather Observation Station 5.pgsql
new file mode 100644
index 0000000..c7c95d0
--- /dev/null
+++ b/Weather Observation Station 5.pgsql	
@@ -0,0 +1,5 @@
+--https://www.hackerrank.com/challenges/weather-observation-station-5/problem
+select city , length(city) from station
+order by length(city) ,city limit 1;
+select city , length(city) from station
+order by length(city) desc, city limit 1;

From 495c71628fb4a5e17329224c7ab1a43cc7c95e2f Mon Sep 17 00:00:00 2001
From: Harsh Tyagi <48311361+HarshTyagi007@users.noreply.github.com>
Date: Thu, 7 Oct 2021 13:00:19 +0530
Subject: [PATCH 15/20] Create PopulationCensus.pgsql (#12)

---
 PopulationCensus.pgsql | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 PopulationCensus.pgsql

diff --git a/PopulationCensus.pgsql b/PopulationCensus.pgsql
new file mode 100644
index 0000000..73bb41f
--- /dev/null
+++ b/PopulationCensus.pgsql
@@ -0,0 +1,2 @@
+--https://www.hackerrank.com/challenges/asian-population/problem?utm_campaign=challenge-recommendation&utm_medium=email&utm_source=24-hour-campaign
+select sum(c.population) from city as c,country as ct where C.CountryCode=Ct.Code and  CONTINENT = 'Asia';

From fb1565b1d3da5804a5adaef83b4b189aa0e36405 Mon Sep 17 00:00:00 2001
From: Ankit Raj <44525721+ankit039@users.noreply.github.com>
Date: Sat, 23 Oct 2021 11:28:12 +0530
Subject: [PATCH 16/20] Create binary-tree-node.pgsql

---
 binary-tree-node.pgsql | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 binary-tree-node.pgsql

diff --git a/binary-tree-node.pgsql b/binary-tree-node.pgsql
new file mode 100644
index 0000000..3922729
--- /dev/null
+++ b/binary-tree-node.pgsql
@@ -0,0 +1 @@
+SELECT N, IF(P IS NULL,’Root’,IF((SELECT COUNT(*) FROM BST WHERE P=B.N)>0,’Inner’,’Leaf’)) FROM BST AS B ORDER BY N;

From 7650239feb160f5b623fd431f2a86473ab9c71c8 Mon Sep 17 00:00:00 2001
From: sahastrakishore123
 <44016054+sahastrakishore123@users.noreply.github.com>
Date: Fri, 29 Oct 2021 13:23:05 +0530
Subject: [PATCH 17/20] Create select_by_id.pgsql

---
 select_by_id.pgsql | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 select_by_id.pgsql

diff --git a/select_by_id.pgsql b/select_by_id.pgsql
new file mode 100644
index 0000000..7128803
--- /dev/null
+++ b/select_by_id.pgsql
@@ -0,0 +1,2 @@
+SELECT * FROM CITY
+WHERE ID="1661";

From d64ce7d5938cd87429288324dd9d3a4f75b72ac8 Mon Sep 17 00:00:00 2001
From: sahastrakishore123
 <44016054+sahastrakishore123@users.noreply.github.com>
Date: Fri, 29 Oct 2021 13:25:03 +0530
Subject: [PATCH 18/20] Create Population_density.pgsql

---
 Population_density.pgsql | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 Population_density.pgsql

diff --git a/Population_density.pgsql b/Population_density.pgsql
new file mode 100644
index 0000000..6c64eb8
--- /dev/null
+++ b/Population_density.pgsql
@@ -0,0 +1 @@
+SELECT MAX(POPULATION)- MIN(POPULATION) FROM CITY;

From e0991dd25e8b61eba353ba1fa39ae907b569e6b1 Mon Sep 17 00:00:00 2001
From: sahastrakishore123
 <44016054+sahastrakishore123@users.noreply.github.com>
Date: Fri, 29 Oct 2021 13:27:49 +0530
Subject: [PATCH 19/20] Added Draw_the_triangle.pgsql

---
 draw_the_triangle1.pgsql | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 draw_the_triangle1.pgsql

diff --git a/draw_the_triangle1.pgsql b/draw_the_triangle1.pgsql
new file mode 100644
index 0000000..bd88718
--- /dev/null
+++ b/draw_the_triangle1.pgsql
@@ -0,0 +1,2 @@
+set @num= 21;
+select repeat('* ', @num := @num -1) from information_schema.tables;

From 939df22e9266c42eb201ebb3a3fd5f8d6dbd4cb0 Mon Sep 17 00:00:00 2001
From: sahastrakishore123
 <44016054+sahastrakishore123@users.noreply.github.com>
Date: Fri, 29 Oct 2021 13:29:03 +0530
Subject: [PATCH 20/20] Create draw_the_triangle2.pgsql

---
 draw_the_triangle2.pgsql | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 draw_the_triangle2.pgsql

diff --git a/draw_the_triangle2.pgsql b/draw_the_triangle2.pgsql
new file mode 100644
index 0000000..fcdcdb8
--- /dev/null
+++ b/draw_the_triangle2.pgsql
@@ -0,0 +1,2 @@
+set @num=0;
+select repeat('* ', @num := @num+1) from information_schema.tables LIMIT 20;