Oracle以15分钟为界，统计一天内各时间段的数据笔数

string sql = "select to_char(StartTime, 'yyyy')||'-'|| to_char(StartTime, 'mm')||'-'|| 
to_char(StartTime, 'dd')||' '|| to_char(StartTime, 'hh24')||':'|| 
floor(to_char(StartTime, 'mi')/15)*15 statime, sum(Count) as Counts from 
table where StartTime <= to_date('2016-11-29 18:00:00' ,'YYYY-MM-DD hh24:mi:ss') 
group by to_char(StartTime, 'yyyy')||'-'|| to_char(StartTime, 'mm')||'-'|| 
to_char(StartTime, 'dd')||' '|| to_char(StartTime, 'hh24')||':'|| 
floor(to_char(StartTime, 'mi')/15)*15 order by statime";

string sql = "select to_char(StartTime, 'yyyy')||'-'|| to_char(StartTime, 'mm')||'-'||" +
             "to_char(StartTime, 'dd')||' '|| to_char(StartTime, 'hh24')||':'|| " + 
             "floor(to_char(StartTime, 'mi')/15)*15 statime, sum(Count) as Counts" + 
             " from table " + 
             "where StartTime <= to_date('2016-11-29 18:00:00' ,'YYYY-MM-DD hh24:mi:ss') " +
             "group by to_char(StartTime, 'yyyy')||'-'|| " + 
             "to_char(StartTime, 'mm')||'-'|| to_char(StartTime, 'dd')||' '|| " + 
             "to_char(StartTime, 'hh24')||':'|| floor(to_char(StartTime, 'mi')/15)*15 order by statime";

如上sql语句

StartTime是其中的时间字段

Count是汇总的字段，也可以count(*)统计记录数

table是表名，自己替换

也可以把15改成30，60等等需要统计汇总的分钟数

同理，按天统计可以修改条件如下，按月年或其他都一样

to_char(StartTime , 'yyyy')||'-'|| to_char(StartTime , 'mm')||'-'|| 

floor(to_char(StartTime , 'dd')/1)*1 sj,