Question

I want to join two tables on a char column. The simplest way I use is:

SELECT * FROM a JOIN b ON (a.text = b.text)

This method is quite fast but it the comparison of field is case insensitive. I have tried STRCMP(.., ..) and .. LIKE .. instead .. = .. but both are far to slow. What is the best solution to join two tables on char column with respect to the letter case?

Answer 1

I’ve no possibility to run a benchmark, but have you tried:

SELECT * FROM a JOIN b ON (BINARY a.text = BINARY b.text)

EDIT

Just as a sidenote: When using the BINARY operator both columns a.text and b.text must use the same character set as comparison is done on the byte-level.