Expression Subqueries in IF Statements

Adaptive Server Enterprise and SQL Anywhere support comparisons between a variable and a scalar value returned by an expression subquery.

For example:
create procedure testIf ()
  begin
  declare var4 int;
set var4 = 10;
  if var4 = (select MIN (a_i1) from a) then set
  	var4 = 100;
end if;
end;
Parent topic: SQL Statements in Procedures and Batches