Usage of database functions "recommended collection"

Hello everyone , I meet you again , I'm your friend, Quan Jun .

dgkhjbxx– Customer list Column （khmc） Customer name Column （khbh） Customer number

apply_main_crdt– The application form Column （cust_no） Customer number

create or replace function cmis_getkhmc(id varchar2)

return varchar2 is khmc_mingcheng dgkhjbxx.khmc%type;

begin

select a.khmc into khmc_mingcheng from dgkhjbxx a where a.khbh=id;

return khmc_mingcheng;

end;

sql The usage in is

select cmis_getkhmc（cust_no） from apply_main_crdt;

This usage is in the corresponding table （dgkhjbxx） There is a corresponding customer number , To find the corresponding name ,

If there is no corresponding number, it will be empty , If there is a corresponding number, the corresponding customer name will be displayed

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