mySQL返回每个字段的特定行

我会尽我最大的努力来解释这个。。。我希望为每个字段返回5个随机行。例如，我有：

选择名称、票证ID、频道 从票上 在日期“2017-09-01”和日期“2017-10-01”之间创建的票证 频道=‘电话’或‘聊天’或‘电子邮件’

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第一个代理主电子邮件='abc。def@mail.com“我想你在寻找这样的东西：

选择名称、票证ID、频道 从票上 在日期“2017-09-01”和日期“2017-10-01”之间创建的票证 频道=‘电话’或‘聊天’或‘电子邮件’ 第一个代理主电子邮件='abc。def@mail.com'

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按兰特限额5订购 您可能需要：

SELECT "Name","Ticket ID","Channel"
FROM Tickets
WHERE "Ticket Created at" between date('2017-09-01') AND date('2017-10-01')
AND ( "Channel" = 'Phone' or "Channel" = 'Chat' or "Channel" = 'Email' )
AND "First Agent Primary Email" = 'abc.def@mail.com'
ORDER BY RAND() LIMIT 5;

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不要对列名称使用引号。。当您有复合名称时，请使用backtics 对多个值使用IN子句，或对每个或条件重复列名 您可以使用limit 5和order by rand获得5个临时行

  SELECT Name,`Ticket ID`,Channel
  FROM Tickets
  WHERE `Ticket Created at` between date('2017-09-01') AND date('2017-10-01')
  AND `Channel` IN ( 'Phone', 'Chat' , 'Email')
  AND `First Agent Primary Email` = 'abc.def@mail.com'
  ORDER BY order by rand() limit 5 

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其他答案的日期范围似乎都有问题，正如您最初的查询一样，因此我决定发布以下内容：

SELECT
    Name, `Ticket ID`, Channel
FROM Tickets
WHERE 
    `Ticket Created at` >= '2017-09-01' AND `Ticket Created at` < '2017-10-01' AND
    Channel IN ('Phone', 'Chat', 'Email') AND
    `First Agent Primary Email` = 'abc.def@mail.com'
ORDER BY
    RAND()
LIMIT 5;

这可能包括发生在10月1日午夜的数据，可能不是你所想的。而且，您不需要用日期来包装日期文字；如果使用了正确的格式，MySQL已经可以处理它们了

编辑：

如果您希望三个频道中的每一个都有5张随机票证，可以通过联合查询来实现：

SELECT Name, `Ticket ID`, Channel
FROM
(
    SELECT Name, `Ticket ID`, Channel
    FROM Tickets
    WHERE `Ticket Created at` >= '2017-09-01' AND
          `Ticket Created at` < '2017-10-01' AND
          Channel = 'Phone' AND
         `First Agent Primary Email` = 'abc.def@mail.com'
    ORDER BY RAND() LIMIT 5
) t1
UNION ALL
(
    SELECT Name, `Ticket ID`, Channel
    FROM Tickets
    WHERE `Ticket Created at` >= '2017-09-01' AND
          `Ticket Created at` < '2017-10-01' AND
          Channel = 'Chat' AND
         `First Agent Primary Email` = 'abc.def@mail.com'
    ORDER BY RAND() LIMIT 5
) t2
UNION ALL
(
    SELECT Name, `Ticket ID`, Channel
    FROM Tickets
    WHERE `Ticket Created at` >= '2017-09-01' AND
          `Ticket Created at` < '2017-10-01' AND
          Channel = 'Email' AND
         `First Agent Primary Email` = 'abc.def@mail.com'
    ORDER BY RAND() LIMIT 5
) t3;

尝试此查询

SELECT Name,Ticket ID,Channel FROM Tickets
WHERE Ticket Created at between date('2017-09-01') 
AND date('2017-10 
01')
AND Channel IN ( 'Phone', 'Chat' , 'Email')
AND First Agent Primary Email = 'abc.def@mail.com'
ORDER BY  RAND() LIMIT 5;

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没有用于SQL on Stack Overflow的内置代码段谢谢！如果我想在数据库中为每个频道返回5个票证ID，那么5个电话票证ID、5个聊天票证ID和5个电子邮件票证ID，我该怎么办？@AJT你刚才要求的是一个完全不同的查询。我们如何知道您不会第三次更改您的要求？我很抱歉误解您，但我最初的问题是，我想做的是让表在每个电话频道、每个聊天频道或每个电子邮件频道返回5个随机票证ID。例：5个随机ID用于电话，5个用于聊天，5个用于电子邮件。@AJT我的错…我查看了其他答案，并假设他们读对了。我用一种方法进行了更新，即使用三个子查询的并集。这种更新确实帮了我的忙。谢谢你！非常感谢你！

SELECT Name,Ticket ID,Channel FROM Tickets
WHERE Ticket Created at between date('2017-09-01') 
AND date('2017-10 
01')
AND Channel IN ( 'Phone', 'Chat' , 'Email')
AND First Agent Primary Email = 'abc.def@mail.com'
ORDER BY  RAND() LIMIT 5;