mysql - 第 6 行的 SQL 语法错误

Question

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

Answer 1

proper syntax是:

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