[Koha] Regarding change the case of text to proper case

Hi, Our koha database is having data completely all text with upper case. We wanted to change the case of the text. We wanted to change the case of text to proper case. I searched for how to go about, was able to do in mysql by exporting data and re-importing after changing the text by exporting the data to excel. But I could not get how I can do it with marcxml data. Could any one help me with any mysql query for updating the marcxml data in changing the text case. -- Regards T. Suresh Kumar