I have a huge mysql table (20 columns by 320.000 rows) that contains a lot of text from a lot of languages and the problem is that I need to identify all the unique characters in that table. For example, if character "," appears one time or more than one time in that table I need this query to show it to me once.
The query should return a list with all the unique characters from this database. I don’t need the query to count them.
Can you help me finding this solution? Thanks in advance, Catalin