mysql怎么查詢序號中未出現的數據

可以使用以下SQL語句來查詢序號中未出現的數據：

SELECT missing_numbers.number
FROM (
    SELECT ones.number + tens.number * 10 + hundreds.number * 100 AS number
    FROM (SELECT 0 AS number UNION SELECT 1 UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9) AS ones
    CROSS JOIN (SELECT 0 AS number UNION SELECT 1 UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9) AS tens
    CROSS JOIN (SELECT 0 AS number UNION SELECT 1 UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9) AS hundreds
) AS missing_numbers
LEFT JOIN your_table ON missing_numbers.number = your_table.id
WHERE your_table.id IS NULL
ORDER BY missing_numbers.number;

在這個SQL語句中，我們首先生成一個包含所有可能序號的臨時表missing_numbers，然后左連接your_table表，通過判斷your_table.id是否為NULL來確定序號中是否未出現的數據。最后按照序號進行排序輸出。