H>query_sql prev_class homunculus

[utofaery 7]

Was having trouble to create the line to read prev_class example

 

player 1 has evolved homunculus 6009

and i want to make that npc script read from sql

it evolve from 6001 so how should I struct my script?

 

query_sql  ( select prev_class from homunculus )

and has a check of the player 1's char_id if it is triggered by player 1