implemented army scenario

0 database.sql

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+use master 
+go 
+drop database if exists ArmyDB
+go 
+create database ArmyDB
+go
+

1 table.sql

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+use ArmyDB
+go
+drop table if exists dbo.Soldier
+go
+create table dbo.Soldier(
+    SoldierID int not null identity primary key,
+    FirstName varchar(25) not null constraint ck_Soldier_first_name_cannot_be_blank check(FirstName <> ''),
+    LastName varchar(25) not null constraint ck_Soldier_last_name_cannot_be_blank check(LastName <> ''),
+    SSN char(10) not null constraint ck_Soldier_SSN_cannot_exceed_10_digits_and_cannot_have_letters check(SSN like ('[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]-[0-9]')),
+    DOB date not null,
+    PlaceOfResidence varchar(40) not null constraint ck_Soldier_place_of_residence_cannot_be_blank check(PlaceOfResidence <> ''),
+    DateEnlisted date not null 
+        constraint ck_Soldier_date_enlisted_cannot_be_a_future_date check(DateEnlisted <= getdate()),
+    ServiceUnit varchar(15) not null 
+        constraint ck_Soldier_service_unit_must_be_air_force_navy_or_ground_force check(ServiceUnit in('Air Force', 'Ground Force', 'Navy')),
+    Rank varchar(90) not null constraint ck_Soldier_rank_cannot_be_blank check(Rank <> ''),
+    IQLevel int not null constraint ck_Soldier_IQ_level_must_be_greater_than_0 check(IQLevel > 0),
+    constraint ck_Soldier_must_be_at_least_17_when_enlisted check(datediff(year, DOB, DateEnlisted) >= 17) 
+)
+go

2 data.sql

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+use ArmyDB
+go
+
+delete Soldier
+insert Soldier(FirstName, LastName, SSN, DOB, PlaceOfResidence, DateEnlisted, ServiceUnit, Rank, IQLevel)
+select 'Ron', 'Aviad', '54876373-2', '01/01/2000', 'Caesarea', '01/03/2021', 'Air Force', 'sergeant', 95
+union select 'Shachar', 'Dotan', '85274136-9', '08/16/2001', 'Jerusalem', '10/01/2020', 'Navy', 'lieutenant colonel', 111
+union select 'Osher', 'Sharon', '95135778-2', '05/04/1996', 'Tel-Aviv', '04/01/2017', 'Ground Force', 'sergeant', 79
+union select 'Yoni', 'Tamari', '24863570-5', '11/23/1999', 'Jerusalem', '12/01/2018', 'Air Force', 'lieutenant general', 139
+union select 'Shai', 'Ben Zeev', '93185378-1', '09/13/2001', 'Netanya', '01/01/2020', 'Air Force', 'sergeant', 120
+union select 'Dory', 'Lavie', '16834952-7', '10/28/2004', 'Haifa', '12/01/2021', 'Navy', 'brigadier general', 118
+

3 reports.sql

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+
+--1) Show a list of all soldiers with all details sorted by IQ level from high to low.
+select *
+from Soldier s
+order by s.IQLevel desc
+
+--2) I need a list of all soldiers sorted by age at enlistment from high to low. Do not include columns that are not relevant to this list.
+select AgeAtEnlistment = datediff(year, s.DOB, s.DateEnlisted), s.LastName
+from Soldier s
+order by AgeAtEnlistment desc
+
+/* 3) Following an upward trend in recruitment since the outbreak of Covid, I need data on recruitment between the years 2017-2019 compared to the years 2020-2022.
+The format should be as follows :Year Range (2017-2019/2020-2022), First Name Last Name - SSN (date of enlistment), service unit.
+(This should be done by using a union select and adding a literal column for year range.) */
+select YearRange = 
+case
+    when year(s.DateEnlisted) between 2017 and 2019 then '2017-2019'
+    when year(s.DateEnlisted) between 2020 and 2022 then '2020-2022'
+end
+, SoldierInfo = concat(s.FirstName, ' ', s.LastName, ' - ', s.SSN, ' (', s.DateEnlisted, '), ',s.ServiceUnit)
+from Soldier s
+--4) I need to know what the average IQ level is for soldiers per service unit.
+select AvgIQ = avg(s.IQLevel), s.ServiceUnit
+from Soldier s
+group by s.ServiceUnit