create table bakery (
	id bigint,
	name varchar(255),
	profit_margin	bigint
)


create table cake{
	id bigint,
	name varchar(255),
	price bigint,
	bakery_id bigint,
	gluten_free bigint,
	serial bigint
}

select
	name,
	bakery,
	EXISTS ( SELECT 1 FROM `cake` WHERE `id` = 1 ) AS `exist`,
	-- Coalesce not only support SimpleExpr, logic is correct
	COALESCE (
		-- QueryStatement
		( SELECT count(*) FROM `cake` WHERE `bakery_id` = 27 ), 
		-- SimpleExpr, select or const 
		(SELECT 0),
		0 
	) AS `count` 
from bakery
where id = 27