為什么我的查詢沒有返回正確的結果？

Question

我正在嘗試排除具有channel = all和category = Increase Customer Loyalty的記錄。 這兩個條件結合在一起，因為我有這個類別但不同渠道的記錄。 在我的 SQL 的某個地方，我做錯了什么，因為執行它會排除所有行。 例如，當我希望看到其中一半時的所有記錄。

SELECT * FROM `flows_predefined`
WHERE platform = 'shopify'
AND status = 1
AND (
    category != 'Increase Customer Loyalty'
    AND channel != 'all'
)
ORDER BY `flows_predefined`.`id` DESC;

Answer 1

問題是您要排除符合條件的記錄

    category = 'Increase Customer Loyalty'
    AND channel = 'all'

但是您的 where 會查看結果記錄應滿足的邏輯表達式。 所以你需要否定這個條件：

NOT (
    category = 'Increase Customer Loyalty'
    AND channel = 'all'
}

現在讓我們將其應用於您的查詢：

SELECT * FROM `flows_predefined`
WHERE platform = 'shopify'
AND status = 1
AND NOT (
    category = 'Increase Customer Loyalty'
    AND channel = 'all'
)
ORDER BY `flows_predefined`.`id` DESC;

或者，如果您更喜歡!=操作數：

SELECT * FROM `flows_predefined`
WHERE platform = 'shopify'
AND status = 1
AND (
    category = 'Increase Customer Loyalty'
    OR channel = 'all'
)
ORDER BY `flows_predefined`.`id` DESC;