Learn the first chapter of sql books, and then understand

Chapter One

1: What is a database?

2; What is a relational database (RDBMS)?

3：

Explain what it means

4: Restrictions on database table names

5; CREATE DATABASE myFirstDatabase;

 

DROP DATABASE myFirstDatabase;\

Explain what he meant

6 Common data types:

 

 

 

type of data	usage
Char	text data
Varchar	Variable length
Nchar
Nvarchar
int	Large range of values
smallint	Small range
real	8 after decimal point
decimal	After the decimal point
datetime	date
datetime	time

7: Syntax to create a table

8: Create table example

CREATE TABLE Train_Times

(

    start_location varchar(75),

    destination varchar ( 75 ),

    departs time ,

    arrival time

)

 

 

9: Change existing table