1. CS 3630 Database Design and Implementation

2. Mapping E-R Model to Relational Schema Due Wednesday, April 4, by 5 pm
Project Phase II
Mapping E-R Model to Relational Schema Due Wednesday, April 4, by 5 pm

3. SQL Query Clause Select and From
From booking;
select hotel_no, guest_no, room_no
from booking;
select Distinct hotel_no, guest_no, room_no
-- Remove duplicate records
-- Unique also works
Should be updated using tables from Assignment 7

4. Oracle Command Column (Col)
Column Hotel_no format A9
Col Hotel_No format a9 heading 'Hotel No'
-- This also work
col Hotel_no format a9 heading "Hotel No"
-- to get leading decimal digits
Column Price format $ heading 'Price/Night'
-- to get leading 0s
Column Price format $ heading 'Price/Night'
Col Date_To format a16 heading 'Date of Leaving'
Col Date_From format a16 heading 'Date of|Arrival'
Select * from Room;
Select * from Booking;
Clear col

5. Clause Where Select * From Room Where RType = 'Single‘;
-- Where clause to specify the condition
-- Operators And/Or
Where Price > 35 and RType = 'Single‘;
-- Where Price > 35 or RType = 'Single'

6. Operator NOT (!) Select * From Room
Where Price > 35 and RType != 'Family';
-- Where Price > 35 and Not (RType = 'Family‘)
-- Where Price > 35 and NOT RType = 'Family‘
-- Not working:
-- Where Price > 35 and !(RType = 'Family‘)

7. Operator NOT (!) Select * From Room
Where Not (Price > 35 and RType = 'Family');
-- Not the same!
Where Not Price > 35 and RType = 'Family';
--Where (Not Price > 35) and RType = 'Family';
--Where Price <= 35 and RType = 'Family';

8. Operator Between Select * From Room Where Price between 30 and 45;
-- inclusive
Where Price Not between 30 and 45;
-- Where Not Price between 30 and 45;

9. Operator IN Select * From Room Where Price in (30, 40, 45); -- Same as
-- Where Price = 30 or Price = 40 or Price = 45
Where Price Not in (30, 40, 45);
-- Where Not Price in (30, 40, 45);

10. Comparing Strings Operator Like and %
Select *
From guest
Where guest_name = 'Mary Tregear'
Where guest_name like 'M%';
-- All guests with name beginning with 'M‘
-- %: any string of zero or more chars

11. Operator Like and Char ‘_’
-- All records whose Fname has 'M' for 3rd position
Select *
From Guest
Where guest_name like '__M%';
-- _: any single char

12. Null Value Select * From Guest Where Address = null;
-- No row is selected
-- null != null
Where Address is null;
-- Some rows may be selected

13. Changing Headings -- use " " for heading -- Use ' ' for string
-- With or without "AS"
Select Guest_no, Guest_name as "Guest Name"
From Guest;
Select Guest_no, Guest_name "Guest Name"
Select Guest_no, Guest_name as GuestName
Select Guest_no, Guest_name GuestName

14. Sorting the Result Select * From Room Order by Price desc;
-- ASC is the default

15. Sorting the Result Select * From Room Order by Hotel_No, Price desc;
-- Sorting first on Hotel_No (asc),
-- then on Price (desc)
-- ASC is the default

16. Sorting the Result Select Hotel_No, Room_No, RType From Room
Order by Hotel_No, Price desc;
-- Price may not be selected

17. Sorting the Result -- Can be used in Order by
Select Guest_no, Guest_name as GuestName
From Guest
Order by GuestName;
Select Guest_no, Guest_name as "Guest Name"
Order by "Guest Name“;

18. Numeric Operators/Functions
Select Hotel_No, Room_No, Price * 0.90 "Discount Price"
From Room;
-- Where Hotel_No = ‘H01';
-- operators: +, -, /, *
-- functions: ceil, floor, mod, power, sign, sqrt

19. Character Functions Select Guest_Name || ' From ' || Address
From Guest
Where Address is not null;

20. Character Functions Lower Upper Initcap length replace
-- Replace all occurrences
substr
Instr

21. Character Functions Select substr(Guest_name, 1, 9) From Guest;
-- substr(Guest_name, 1, 9) up to 9 characters
Select *
From Guest
where instr(Guest_name, 'T', 6) > 0;
where instr(Guest_name, 'T', 7) > 0;

22. Due Friday, April 6 Formatting Style
Assignment 8
Due Friday, April 6 Formatting Style