Postgres nested if in case query

Question

Could you tell my why the following isnt working in postgres sql?:

See updated code below

UPDATE:

I expect the query to return \"0.30\"

Answer 1

There is no IF expr THEN result ELSE result END syntax for normal SQL queries in Postgres. As there is neither an IF() function as in MySQL, you have to use CASE:

select (
  case (select '1')
  when '1' then
    case when 1=1 then 0.30::float else 0.50::float end
  else
     1.00::float
  end
);