将嵌套的mysql查询与另一个表中的字段连接起来

时间:2013-07-23 20:05:15

标签: mysql sql join

我有一个包含整数和参数的表:

date timestamp
123  2013-07-22 16:33:17
123  2013-07-22 16:34:47
234  2013-07-20 16:33:15
332  2013-07-24 16:33:37
422  2013-07-21 10:13:11
422  2013-07-22 14:53:12

我运行以下查询以获取它所选择的不同数据的数量以及随机的一组不同数据:

SELECT COUNT(DISTINCT(data)) as count, (SELECT data FROM data_table WHERE
    DATE(timestamp) >= '2013/07/22' AND DATE(timestamp) < '2013/07/23'
    GROUP BY data ORDER BY rand() LIMIT 1) as data FROM data_table WHERE
    DATE(timestamp) >= '2013/07/22' AND DATE(timestamp) < '2013/07/23'

我得到了:

count  data
2      123

count  data
2      422

现在我有另一个表,* text_table *,带有PRIMARY键数据。它看起来像这样:

data  text
123   "hi"
234   "hey"
332   "bye"
422   "cya"

我需要查询来获取上一个查询的结果,再加上文本

count  data  text
2      123   "hi"

count  data  text
2      422   "cya"

我试过了:

SELECT text_table.text AS text, COUNT(DISTINCT(data_table.data)) as count,
    (SELECT data FROM data_table GROUP BY data ORDER BY rand() LIMIT 1) as data
    FROM data_table LEFT OUTER JOIN text_table ON data_table.date = text_table.text

但无论数据是什么,它都会一直返回相同的文本

2 个答案:

答案 0 :(得分:1)

我是这样做的,以获得您需要的所有信息。

SELECT COUNT(dt.date) count, dt.date, tt.text FROM data_table dt
JOIN text_table tt ON tt.date = dt.date
GROUP BY dt.date, tt.text

现在您只需要对其进行过滤即可获得所需的数据。

像这样,

SELECT COUNT(dt.date) count, dt.date, tt.text FROM data_table dt
JOIN text_table tt ON tt.date = dt.date
WHERE dt.timestamp > '2013/07/22' AND dt.timestamp < '2013/07/23'
GROUP BY dt.date, tt.text

你也可以获得前1名来获得第一行

谢谢, 奇科

答案 1 :(得分:0)

试试这个:

SELECT  COUNT(DISTINCT(data_table.data)) as count,
    (SELECT data FROM data_table GROUP BY data ORDER BY rand() LIMIT 1) as data 
,text_table.text AS text
FROM data_table JOIN text_table ON data_table.date = text_table.text