Multiple rows can be inserted with a single insert command:

INSERT INTO tbl_name (field1, field2, field3)

`VALUES

(1,2,3),
(4,5,6),
(7,8,9);`

For inserting large quantities of data (bulk insert) at the same time, DBMS-specific features and recommendations exist.

MySQL - LOAD DATA INFILE

MSSQL - BULK INSERT