xia_pw wrote: > Hi,I have read the source codes of pgsql these days,and I want to know > which part of the source codes deal with the function of executing the > sql(select,alter,and so on),and which function deal with the query > operation. Thank! Why? If you want to add functionality you'll need to discuss it first on the -hackers list and they will be able to point you in the right direction. -- Postgresql & php tutorials http://www.designmagick.com/