Question

Is the database query faster if I insert multiple rows at once:

like

INSERT....

UNION

INSERT....

UNION

(I need to insert like 2-3000 rows)

Answer 1

INSERT statements that use VALUES syntax can insert multiple rows. To do this, include multiple lists of column values, each enclosed within parentheses and separated by commas.

Example:

INSERT INTO tbl_name
    (a,b,c)
VALUES
    (1,2,3),
    (4,5,6),
    (7,8,9);

Source