從Sqlite中的案例更新

Question

我想更新一個表，必須測試每一行，並且文本字段必須根據另一個表的主鍵更新爲numéric值。 3個可能的文本值可以與3個數值中的一個相關聯。我發現這個請求，它在每一行返回相同的第一個數值，'2'！

UPDATE HIV_adults_or_women_or_children_living_with_HIV SET indicateur_reduit=(
CASE 
WHEN ((select indicateur_in FROM HIV_adults_or_women_or_children_living_with_HIV) = "Number of adults aged 15 and over living with HIV") 
THEN (1) 
WHEN ((SELECT indicateur_in FROM HIV_adults_or_women_or_children_living_with_HIV) = "Number of women aged 15 and over living with HIV") 
THEN (2) 
WHEN ((select indicateur_in FROM HIV_adults_or_women_or_children_living_with_HIV) = "Number of children under 15 living with HIV") 
THEN (3) 
END) 

而且我想這下一個無效的，因爲它給了「沒有這樣的列idResult」：

UPDATE HIV_adults_or_women_or_children_living_with_HIV SET indicateur_reduit=(
SELECT (SELECT ID FROM HIV_adults_or_women_or_children_living_with_HIV) as idResult, 
CASE 
WHEN ((SELECT indicateur_in FROM HIV_adults_or_women_or_children_living_with_HIV WHERE id) = "Number of women aged 15 and over living with HIV") 
THEN (1) 
WHEN ((select indicateur_in FROM HIV_adults_or_women_or_children_living_with_HIV WHERE id) = "Number of children under 15 living with HIV") 
THEN (2) 
WHEN ((select indicateur_in FROM HIV_adults_or_women_or_children_living_with_HIV WHERE id) = "Number of adults aged 15 and over living with HIV") 
THEN (3) 
END) 
WHERE id=idResult 

所以，我可以通過彎曲試驗和更新的每一行，在第一個我將使用選擇指令返回一行，其次我會更新它...這可能是一個有效的解決方案，但它會做很多事情，沒有多少工作。

Answer 1

您不需要子查詢。假設所有信息來自單行：

UPDATE HIV_adults_or_women_or_children_living_with_HIV 
    SET indicateur_reduit = (CASE WHEN indicateur_in = 'Number of adults aged 15 and over living with HIV' 
            THEN 1 
            WHEN indicateur_in = 'Number of women aged 15 and over living with HIV' 
            THEN 2 
            WHEN indicateur_in = 'Number of children under 15 living with HIV' 
            THEN 3 
           END)