如果语句使用INSERT作为then子句（MYSQL）

Question

I am making a conditional insert but i having trouble making one.

the condition is something like this

if(select count(*) from employee < 3, insert into employee (name) values ("lisa");

Answer 1

You can try like this:

SET some_var = (select count(*) from employee);

if(some_var < 3) then
    insert into employee (name) values ("lisa");
end if

or like

SELECT COUNT(*) AS count into @some_var FROM employee;
if(@some_var < 3) then
    insert into employee (name) values ("lisa");
end if;

Answer 2

Try this:

insert into employee(name)
    select 'lisa'
   where (select count(*) from employee) < 3;