在联盟中不期望查询结果

Question

我有这个查询，可以检索本周和上周某些产品的数量。我希望这个数量与相应的周相关，而不是累积。

SELECT 'Last Week' AS Last_week, 
SUM( CASE WHEN week IN ( 1 ) THEN tinta ELSE 0 END ) AS last_week_tinta, 
SUM( CASE WHEN week IN ( 1 ) THEN semi ELSE 0 END ) AS last_week_semi, 
SUM( CASE WHEN week IN ( 1 ) THEN so_pure ELSE 0 END ) AS last_week_so_pure 
FROM wp_8_bi_helper_custom t 
WHERE NOT EXISTS ( SELECT 1 FROM wp_8_bi_helper_custom t2 WHERE t2.person = t.person AND t2.week = t.week AND t2.iteration > t.iteration )

UNION ALL 

SELECT 'Current Week' AS Current_Week, 
SUM( CASE WHEN week IN ( 2 ) THEN tinta ELSE 0 END ) AS tinta, 
SUM( CASE WHEN week IN ( 2 ) THEN semi ELSE 0 END ) AS semi, 
SUM( CASE WHEN week IN ( 2 ) THEN so_pure ELSE 0 END ) AS so_pure 
FROM wp_11_bi_helper_custom t 
WHERE NOT EXISTS ( SELECT 1 FROM wp_8_bi_helper_custom t2 WHERE t2.person = t.person AND t2.week = t.week AND t2.iteration > t.iteration )

然而，上周的结果是正确的，但本周不是。

我得到了这个结果

Last_week    last_week_tinta     last_week_semi    last_week_so_pure
Last Week    2                   1                 3
Current Week 13                  3                 1

我应该什么时候

Last_week    last_week_tinta     last_week_semi    last_week_so_pure
Last Week    2                   1                 3
Current Week 0                   0                 1

第一栏仅用于标注目的，但需要在那里。 我不是SQL的专家，所以任何帮助都表示赞赏。