sql - create column data mysql evaluating hour column -

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i have column datatime type hour in mysql, , want read column , create other days each hour(0-23:59). put image explain better. intent with

for rowshour   day = 0   if rowhour[i] < rowhour      day = day + 1

thanks all. best regards!

the table, , column of date same want http://i.stack.imgur.com/87ten.jpg

i believe asking 2 columns.

|--id--|--name--|----dt----|--hr--| |  1   |  data  |2015-04-22|  00  | |  1   |  data  |2015-04-22|  12  | |  1   |  data  |2015-04-22|  20  | |  1   |  data  |2015-04-22|  21  |

for hour (hr) use integer instead of datetime. dt use datetime, have exact minute. when query use date(),

finally can use ever incrementing integer format of this: yyyymmddhh, example 2015-04-22 @ 12 2015042212


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