Question

看看我的问题：

INSERT INTO sessions (userId, workstationId, duration, actionType)
    SELECT userId, workstationId, duration
    FROM activeSessions
    WHERE workstationId = ?

select语句不包含足以推送到sessions的数据。我也想插入一个actionType（作为参数（?）。也就是说，我需要在select语句的结果右侧附加一列，以便它能够工作。如何完成？

Answer 1

您可以在mysql select：

中使用虚拟值

INSERT INTO sessions (userId, workstationId, duration, actionType)
    SELECT userId, workstationId, duration, 'actionType' as actionType
    FROM activeSessions
    WHERE workstationId = ?

对于不同的参数，您还可以使用select select select query。

INSERT INTO sessions (userId, workstationId, duration, actionType)
        SELECT userId, workstationId, duration, 
        (select id from actionTypeTable where id = ?) as actionType
        FROM activeSessions
        WHERE workstationId = ?

Answer 2

假设您的查询位于某个过程中，您可以添加这些参数。

INSERT INTO sessions (userId, workstationId, duration, actionType)
    SELECT userId, workstationId, duration, @actionType
    FROM activeSessions
    WHERE workstationId = @workstationId

INSERT INTO表SELECT＆amp;附加一列

2 个答案: