Select 查詢與 Oracle SQL 中的子查詢

Question

這是我試圖通過大量簡化來實現的一個例子。

我有一張這樣的桌子：

CREATE TABLE temp_pt
    (
        pt_key          number PRIMARY KEY
        , history       VARCHAR(20)
        , country       VARCHAR(2)
        , currency      VARCHAR(3)
        , settlementday VARCHAR(10)
    );

這張表中有一些記錄，說如下：

insert into  temp_pt(PT_KEY, history, country, currency, settlementday) values(1,  'MATCH', 'GB', 'GBP', '2020-12-01');
insert into  temp_pt(PT_KEY, history, country, currency, settlementday) values(2,  'MATCH', 'GB', 'GBP', '2021-12-01');
insert into  temp_pt(PT_KEY, history, country, currency, settlementday) values(3,  'MATCH', 'GB', 'EUR', '2020-12-01');
insert into  temp_pt(PT_KEY, history, country, currency, settlementday) values(4,  'MATCH', 'GB', 'EUR', '2021-12-01');
insert into  temp_pt(PT_KEY, history, country, currency, settlementday) values(5,  'MATCH', 'GI', 'GBP', '2020-12-01');
insert into  temp_pt(PT_KEY, history, country, currency, settlementday) values(6,  'MATCH', 'GI', 'GBP', '2021-12-01');
insert into  temp_pt(PT_KEY, history, country, currency, settlementday) values(7,  'MATCH', 'GI', 'EUR', '2020-12-01');
insert into  temp_pt(PT_KEY, history, country, currency, settlementday) values(8,  'MATCH', 'GI', 'EUR', '2021-12-01');
insert into  temp_pt(PT_KEY, history, country, currency, settlementday) values(9,  'MATCH', 'NL', 'GBP', '2020-12-01');
insert into  temp_pt(PT_KEY, history, country, currency, settlementday) values(10, 'MATCH', 'NL', 'GBP', '2021-12-01');
insert into  temp_pt(PT_KEY, history, country, currency, settlementday) values(11, 'MATCH', 'NL', 'EUR', '2020-12-01');
insert into  temp_pt(PT_KEY, history, country, currency, settlementday) values(12, 'MATCH', 'NL', 'EUR', '2021-12-01');

我需要結算日 > 2020-12-31 的所有記錄，除了那些（貨幣是 GBP，國家是 GB 或 GI）。 我怎么寫這個？

Answer 1

需要 select 此表中貨幣為 GBP 的所有記錄，但如果國家/地區為 GB 或 GI，則不需要。

這似乎是一個簡單的where子句：

select t.*
from temp_pt
where current = 'GBP' and country not in ('GB', 'GI')

Answer 2

我想我找到了答案，但它並不優雅：

SELECT  * from temp_pt 
where 
TO_DATE(settlementday,'yyyy-MM-dd') > TO_DATE('2020-12-31','yyyy-MM-dd') AND pt_key NOT IN 
(SELECT PT_KEY FROM TEMP_PT WHERE currency = 'GBP' 
AND country IN ('GB', 'GI') 
AND TO_DATE(settlementday,'yyyy-MM-dd') > TO_DATE('2020-12-31','yyyy-MM-dd'))
;