Is ST an abbreviation for "sort" ?
"keys can go max to 30", 30 what? Are you talking about string length?
"keys for a query would be same", are you saying that there can be duplicate keys?
Which field is the key?
If the key is the first field, what do these numbers mean?
"Find the type of key", what different types of keys do you expect ?
Maybe an example of what you want to achieve would be helpful
UPDATE: Strangely Tilly seems to understand what you want. How do you do that, Tilly? ;-)
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