sql - SQL查询 - 如何显示数据何时重复x个条目

Question

我正在使用 SQL Server 2008 R2 Standard，但我对 SQL Server 还是很陌生。

我试图找出当 ax （测量值）具有超过 48 个日期时间间隔的趋势数据时。

提前致谢。

我的基本查询结构是

SELECT sites.site_name, 
       measurements.measurement_name, 
       trend_data_temp.trend_data_avg, 
       trend_data_temp.trend_data_time 
FROM   sites 
       INNER JOIN group_sites 
               ON sites.site_id = group_sites.site_id 
       INNER JOIN groups 
               ON group_sites.group_id = groups.group_id 
       INNER JOIN measurements 
               ON sites.site_id = measurements.site_id 
       INNER JOIN trend_data 
               ON measurements.measurement_id = trend_data.measurement_id 
       INNER JOIN trend_data_temp 
               ON measurements.measurement_id = trend_data_temp.measurement_id 
GROUP  BY sites.site_name, 
          measurements.measurement_name, 
          trend_data_temp.trend_data_avg, 
          trend_data_temp.trend_data_time 
ORDER  BY sites.site_name, 
          measurements.measurement_name 

Answer 1

稍微有点黑暗，没有输入数据和输出数据的任何轮廓，但也许你需要这样的东西（未经测试）

   SELECT 
           sites.site_name, 
           measurements.measurement_name, 
           trend_data_temp.trend_data_avg, 
           [occurances] = count(trend_data_temp.trend_data_time) 
    FROM   sites 
           INNER JOIN group_sites 
                   ON sites.site_id = group_sites.site_id 
           INNER JOIN groups 
                   ON group_sites.group_id = groups.group_id 
           INNER JOIN measurements 
                   ON sites.site_id = measurements.site_id 
           INNER JOIN trend_data 
                   ON measurements.measurement_id = trend_data.measurement_id 
           INNER JOIN trend_data_temp 
                   ON measurements.measurement_id = trend_data_temp.measurement_id 
    GROUP  BY 
           sites.site_name, 
           measurements.measurement_name, 
           trend_data_temp.trend_data_avg
    HAVING count(trend_data_temp.trend_data_time) >=48