CID lookup issuse

hello,

i am on my way to create CID lookup source.i have choose mysql as source type.
but my problem is, i confuse about what should i put in the Query field.

are this is related to the asterisk server??

sorry for asking the simple question, but i need some explanation from expert.
thank you.

please…!!!

any one have an idea about this…?
i am running on time.