To install mysql: (You will have it installed in lab computer; in case you want to install it in your personal
computer)
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May have to install, depending on the computer setting:
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Go to:
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Then select:
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visual studio x64 redistributable 2019 and over.
https://dev.mysql.com/downloads/mysql/
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Then, select “NO THANKS“
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Now, “mysql-8.1.0-winx64“ will be downloaded.
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Select next in this window:
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Then Select “developer default“ setting.
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Select all default settings.
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Give root password.
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Continue with “next“s, with selecting all default settings.
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Now mysql installation is done.
Creating table:
This is a sample table, named ‘student table’, we are going to create:
student_id
name
major
100
jkl
Computer
science
101
mno
Business
102
pqr
Pharmacy
103
stv
Business
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Go to “mysql command line client” from start window.
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It will ask for the root password. Give, and enter.
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In terminal write:
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create database cdf;
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[here, cdf is the database name].
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[Use a different database name next time, as the table is already created in this database].
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[if it's right, it will show “Query OK”]
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use cdf;
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[it is to use any particular database you are going to use for your coming inputs].
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select database ();
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[now we are going to create a table in this particular database].
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create table student (
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student_id INT,
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name varchar(20),
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major varchar(20),
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primary key (student_id)
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);
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Here," student" is the table name.
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INT: a number that is not a fraction; a whole number.
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Varchar: Can contain letters, numbers, and special characters.
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Enter. [if it's right, it will show “Query OK”].
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20 is the character length.
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show tables;
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It will show all existing tables in the created database.
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describe student;
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It will show the details of the student table.
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Alter table:
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We are going to add gpa column to the existing student table.
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student_id
name
major
gpa
100
jkl
Computer
science
3.56
101
mno
Business
3.04
102
pqr
Pharmacy
3.25
103
stv
Business
3.33
alter table student add gpa decimal(3,2);
○ Decimal numbers are not whole numbers.
○ 3 is total number of digits.
○ 2 is after point, how many digis you want to see.
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describe student;
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Delete table:
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drop table student;
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show tables;
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describe student;
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