嗨,大師, 我正在尋找用存在替換IN子句,但儘管在這裏讀了其他類似的情況下,我還沒有能夠將它們應用到我的數據集。用存在代替子句
我期待在我的主查詢一欄,如果一個基金是一個單獨的列表中找到它告訴我加的,如果是的話那麼其標記爲「緊急」,如果沒有,那麼「非緊急」
列表定義,像這樣:
select
f.id
FROM _audit a
INNER JOIN _fund f ON a.article_id = f.id
WHERE a.entity_name = 'Fund'
AND a.Changes LIKE
'%finance_code2%OldValue>3%'
)
UNION
(
select
id AS fund_reference
FROM _fund
WHERE (finance_code2 LIKE '3%'
OR finance_code2 LIKE '9%')
AND finance_code2 IS NOT NULL
還等什麼我期待的基本上是一樣的東西:
SELECT
...Main query here...
,CASE WHEN fund_id IN (list_details) THEN 'emergency' else 'non-emergency' end
我知道,這將是更有效地做一些事情像
SELECT
...Main query here...
,SELECT CASE WHEN EXISTS
(SELECT fund_id FROM list_details WHERE fund_id IS NOT NULL) THEN 'emergency' else 'non-emergency' END
但每次我嘗試它使返回false值時(說資金都包含在列表中時,他們沒有)
萬一它有助於我使用SQL Server 2005和主查詢在下面列出,其中list_details導致(ID)被接合到donation_fund_allocation上list_details.id = donation_fund_allocation.fund_id
一如既往任何線索將被大規模理解:) 謝謝!
主查詢
SELECT
don.supporter_id AS contact_id
,don.id AS gift_id
,YEAR(don.date_received) AS calendar_year
,YEAR(don.date_received) - CASE WHEN MONTH(don.date_received) < 4 THEN 1 ELSE 0 END AS financial_year
,don.date_received AS date_received
,don.event_id AS event_id
,SUM(CASE WHEN don.gift_aid_status <> 4 THEN don.value_gross * ((dfa.percentage)/100)
WHEN don.gift_aid_status = 4 AND don.value_net > don.value_gross
AND don.value_net <> 0 THEN don.value_net * ((dfa.percentage)/100)
ELSE don.value_gross * ((dfa.percentage)/100)
END
) AS donation_value
--**List details query to go in here**
FROM donation don WITH (nolock)
INNER JOIN donation_fund_allocation dfa WITH (nolock) ON dfa.donation_id = don.id
WHERE don.supporter_id IS NOT NULL
AND don.status = 4
AND don.value_gross <> 0
GROUP BY don.supporter_id
,don.id
,don.date_received
,don.event_id
只需要注意一點:使用簡單的相等謂詞,'IN'和'EXISTS'在'SQL Server'中具有相同的效率,並且產生相同的計劃。 – Quassnoi 2010-11-15 16:45:16