sql - 查找组之间的共同数据

Question

我有这个数据

DeveloperId   Date             remark
--------------------------------------
1             02/01/2013        Google
1             02/02/2013        MSN
1             02/03/2013        Google
1             02/02/2013        MSN
1             02/01/2013        Yahoo
2             02/01/2013        Google
2             02/02/2013        Yahoo
2             02/03/2013        Google
2             02/01/2013        Google

如何动态查找 google 和 Msn 以及 yahoo 的共同日期？

我想将这样的查询放入报告中。

Answer 1

-- Query for dates that have all types of remarks
SELECT
  Date
FROM
  data
GROUP BY 
  Date
HAVING COUNT(DISTINCT remark) = (
  SELECT COUNT(DISTINCT remark)
  FROM data
);

或者，如果这不是要求...

-- Query for dates that have more than one remark.
SELECT
  Date
FROM
  data
GROUP BY 
  Date
HAVING COUNT(DISTINCT remark) > 1;

Sql Fiddle