mysql - SQL syntax error at line 6 - 


create trigger ask before update on invoice     -> each row     -> begin     -> if(3<(select count(invoice_num) invoice customer_name=new.customer_name))     -> set new.bill_amount=new.bill_amount-((5/100)*bill_amount);     -> end;     -> $$

the proper syntax is:

if (condition)    ... else    ... end if;    ^^^----you're missing bit

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