如何使用mysql根据同一表的其他两列填充一列？

Question

我的数据如下（表名为botdata）

现在，我需要透视此数据，以使Chatsession ID作为行，而Metrics作为列。必须有一个新的列Met014，仅当Met003和Met004为1时才应显示1。以下是我正在使用的代码以及得到的结果。其他一切都很好，但是我如何正确填充Met014？

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Answer 1

我会用SUM()来表达这句话。我认为您可以使用LEAST()做您想做的事情：

SELECT ChatSessionID, 
       SUM(Metrics = 'Met001') AS Met001,
       SUM(Metrics = 'Met002') AS Met002,
       . . . . . . . . . . . . . . . . .,
       SUM(Metrics = 'Met012') AS Met012,
       LEAST(SUM(Metrics = 'Met003'), SUM(Metrics = 'Met004')) AS Met014
FROM botdata b
GROUP BY ChatSessionID;

Answer 2

如果您的列Met001至Met013只能取值为1、0或NULL，请尝试执行以下操作：

SELECT 
        T.*, (Met003 + Met004) = 2 AS Met014
    FROM
        (SELECT 
            ChatSessionID,
                Metrics = 'Met001' AS Met001,
                Metrics = 'Met002' AS Met002,
                Metrics = 'Met003' AS Met003,
                Metrics = 'Met004' AS Met004,
                Metrics = 'Met005' AS Met005,
                Metrics = 'Met006' AS Met006,
                Metrics = 'Met007' AS Met007,
                Metrics = 'Met008' AS Met008,
                Metrics = 'Met009' AS Met009,
                Metrics = 'Met010' AS Met010,
                Metrics = 'Met011' AS Met011,
                Metrics = 'Met012' AS Met012,
                Metrics = 'Met013' AS Met013
        FROM
            botdata b
        WHERE
            b.Metrics BETWEEN 'Met001' AND 'Met014'
        GROUP BY ChatSessionID) AS T;