Lecture notes
Structured query language SQL
- Module
- Computer Science
- Institution
- Cambridge University (CAM)
Lecture notes of 79 pages for the course Computer Science at CAM (Basics of SQL)
[Show more]
Seller
Follow
Content preview
https://www.halvorsen.blogStructured Query Language
Hans-Petter Halvorsen
Available Online: https://www.halvorsen.blog
,Structured Query Language
Hans-Petter Halvorsen
Copyright © 2017
https://www.halvorsen.blog
,Table of Contents
1 Introduction to SQL ........................................................................................................... 6
1.1 Data Definition Language (DDL).................................................................................. 8
1.2 Data Manipulation Language (DML) ........................................................................... 8
2 Introduction to SQL Server ................................................................................................ 9
2.1 SQL Server Management Studio ............................................................................... 10
2.1.1 Create a new Database...................................................................................... 11
2.1.2 Queries .............................................................................................................. 12
3 CREATE TABLE ................................................................................................................. 13
3.1 Database Modelling .................................................................................................. 15
3.2 Create Tables using the Designer Tools .................................................................... 17
3.3 SQL Constraints ......................................................................................................... 17
3.3.1 PRIMARY KEY ..................................................................................................... 18
3.3.2 FOREIGN KEY ..................................................................................................... 19
3.3.3 NOT NULL / Required Columns ......................................................................... 22
3.3.4 UNIQUE ............................................................................................................. 23
3.3.5 CHECK ................................................................................................................ 25
3.3.6 DEFAULT ............................................................................................................ 27
3.3.7 AUTO INCREMENT or IDENTITY ......................................................................... 28
3.4 ALTER TABLE ............................................................................................................. 29
4 INSERT INTO .................................................................................................................... 31
5 UPDATE ........................................................................................................................... 33
3
, 4 Table of Contents
6 DELETE ............................................................................................................................. 35
7 SELECT ............................................................................................................................. 37
7.1 The ORDER BY Keyword ............................................................................................ 39
7.2 SELECT DISTINCT ....................................................................................................... 40
7.3 The WHERE Clause .................................................................................................... 40
7.3.1 Operators .......................................................................................................... 41
7.3.2 LIKE Operator .................................................................................................... 41
7.3.3 IN Operator........................................................................................................ 42
7.3.4 BETWEEN Operator ........................................................................................... 42
7.4 Wildcards .................................................................................................................. 42
7.5 AND & OR Operators ................................................................................................ 43
7.6 SELECT TOP Clause .................................................................................................... 44
7.7 Alias .......................................................................................................................... 45
7.8 Joins .......................................................................................................................... 45
7.8.1 Different SQL JOINs ........................................................................................... 46
8 SQL Scripts ....................................................................................................................... 48
8.1 Using Comments ....................................................................................................... 48
8.1.1 Single-line comment .......................................................................................... 48
8.1.2 Multiple-line comment ...................................................................................... 48
8.2 Variables ................................................................................................................... 49
8.3 Built-in Global Variables ........................................................................................... 50
8.3.1 @@IDENTITY ..................................................................................................... 50
8.4 Flow Control ............................................................................................................. 51
8.4.1 IF – ELSE ............................................................................................................. 51
8.4.2 WHILE ................................................................................................................ 52
8.4.3 CASE................................................................................................................... 53
Structured Query Language (SQL)
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller abdalkareemadel93. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £9.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
59325 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now