Check out example codes for "command line mysql import". It will help you in understanding the concepts better.

Code Example 1

mysql -u username -p database_name < file.sql
; OR
 mysql> use db_name;
 mysql> source file_name.sql;

Code Example 2

mysql -u username -p database_name < file.sql

Code Example 3

Source : https://www.programmingquest.com/2018/08/how-to-export-mysql-database-using.html
open cmd
set mysql path in cmd
	set path=c:\wamp\bin\mysql\mysql5.6.17\bin
For database import (Restore): 
	mysql -u YourUser -p YourDatabaseName < filename.sql

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