Никита

Changing the collapsed mobile navbar breakpoint
The navbar collapses into its vertical mobile view when the viewport is narrower than @grid-float-breakpoint, and expands into its horizontal non-mobile view when the viewport is at least @grid-float-breakpoint in width. Adjust this variable in the Less source to control when the navbar collapses/expands. The default value is 768px (the smallest "small" or "tablet" screen).

Зайти сюда www.w3schools.com/sql/trysql.asp?filename=trysql_s...
Вписать это -

SELECT * FROM Customers
ORDER BY CASE WHEN City = "London" THEN 0
    ELSE 1
END;

И результат вроде тот, что вам нужен.