I need to know how to insert data into database and select data from database

Questions & Answers
1

I need to know how to insert data into database and select data from database (offline)

2

This isnt possible

you have to use PlayerPrefs. Otherwise it will be very complicated. But you could use names like this

PlayerPrefs.SetString("TableName[1][1]", "First");
PlayerPrefs.SetString("TableName[1][2]", "Second");
PlayerPrefs.SetString("TableName[2][1]", "Third");

This would look like this in a table or a database:

------------------
| First | Second |
| Third | ...    |
------------------