Scales of measurement or levels of measurement were developed by American psychologist Stanley Smith Stevens(November 4, 1906 – January 18, 1973).
He classified variables into four levels: nominal, ordinal, interval, and ratio.
Based on the order of four levels, the usable operators get more and more from nominal to ratio.
CREATE TABLE "table name" ( "column name1" "data type", "column name2" "data type", "column name3" "data type", ... );
Open apache_start.bat, and cmd will appear.
You can successfully open the XAMMP default page in 127.0.0.1 under the execution of the cmd.
* If the port is not the default, you need to add it behind 127.0.0.1.
Open mysql_start.bat, and cmd will appear.
Then, input 127.0.0.1/phpmyadmin in the URL bar, and you can log in to the database management.
1. download git.exe from https://git-scm.com and install it
2. open Git Bash and key in
ssh-keygen -t rsa -b 4096 -C “email@example.com”
3. keep clicking Enter till to the end