3 ms·Isn't that exactly what adding an index would do internally?by kingcharles 5y agoIsn't that exactly what adding an index would do internally?tyingq 5y ago2002 MySQL had some limitations on indexing variable length string (varchar) columns. That's the gist of the linked story.AdrianB1 5y agoDepending on the RDBMS system, in most cases it does not.