How to Sum "case when" clause after left join without duplication - mysql

Question

How do I get the SUM of an amount in a CASE WHEN clause?
Table real:
id
name
goal
year
10
ronaldo
5
2022
10
ronaldo
5
2022
11
messi
5
2022
11
messi
5
2022
10
ronaldo
10
2021
11
messi
10
2021
Table target:
id
name
goal
year
10
ronaldo
10
2022
11
messi
10
2022
10
ronaldo
10
2021
11
messi
10
2021
I tried inner join, but the result was wrong:
id
name
real 2022
target 2022
real 2021
target 2021
10
ronaldo
20
30
20
30
11
messi
20
30
20
30
Desired result:
id
name
real 2022
target 2022
real 2021
target 2021
10
ronaldo
10
10
10
10
11
messi
10
10
10
10
<?php
$sql = $pdo->prepare("SELECT *,
SUM( case when YEAR(real.year) = YEAR(CURDATE()) then real.goal else 0 end) AS goal_now,
SUM( case when YEAR(real.year) = YEAR(CURDATE() - INTERVAL 1 YEAR) then real.goal else 0 end) AS goal_then,
SUM( case when YEAR(target.year) = YEAR(CURDATE()) then target.goal else 0 end) AS goal_target,
SUM( case when YEAR(target.year) = YEAR(CURDATE() - INTERVAL 1 YEAR) then target.goal else 0 end) AS goal_target_then
FROM real
left join target
on id_real = id_target
group by real.id_real
having
real.id_real LIKE '1%'
");
$sql->execute();
while($data = $sql->fetch()){
?>

Answer 1

select
id,
name,
sum(real_goal_now) as real_goal_now,
sum(real_goal_then) as real_goal_then,
sum(target_goal_now) as target_goal_now,
sum(target_goal_then) as target_goal_then
from
(
select
a.id,
a.name,
case
when a.year = year(curdate()) then a.goal else 0 end as real_goal_now,
case
when a.year = year(curdate() - interval 1 year) then a.goal else 0 end as real_goal_then,
case
when b.year = year(curdate()) then b.goal else 0 end as target_goal_now,
case
when b.year = year(curdate() - interval 1 year) then b.goal else 0 end as target_goal_then
from
(
select
id, name, year, sum(goal) goal
from
real
group by
id, year) a,
(
select
id, name, year, sum(goal) goal
from
target
group by
id, year) b
where
a.id = b.id
and a.year = b.year
group by
a.id, a.year) c
group by
id;

Answer 2

<?php
$sql = $pdo->prepare("SELECT *,
SUM( case when YEAR(real.year) = YEAR(CURDATE()) then real.goal else 0 end) AS goal_now,
SUM( case when YEAR(real.year) = YEAR(CURDATE() - INTERVAL 1 YEAR) then real.goal else 0 end) AS goal_then
FROM real
left join ( select *,
SUM( case when YEAR(target.year) = YEAR(CURDATE()) then target.goal else 0 end) AS goal_target,
SUM( case when YEAR(target.year) = YEAR(CURDATE() - INTERVAL 1 YEAR) then target.goal else 0 end) AS goal_target_then
from target
group by id_target ) as t
on real.id_real = t.id_target
group by real.id_real
having
real.id_real LIKE '1%'
");
$sql->execute();
while($data = $sql->fetch()){
?>