Question

I have mysql table with the following structure. All records are static and only for read, and had been imported from CSV so all year, month, day are in correct sequence as per I created them. (No, ID column in this table because I only access data by year, month and day)

mysql table 'daily'
year month day  data
1990  01    01  xxxxxxxxxxxxx
1990  01    02  eeeeeeeeeeeee
1990  01    03  rrrrrrrrrrrrr
1990  01    04  ttttttttttttt
.
.
.

Now, I can access the records by simple select statement as below

select * where year=1990 and month=1 and day=03 limit 1

But how can I select the query row + 3 or any number of adjacent rows (before or after the query row)? And I don’t want to use ID if there is better solutions.

Answer 1

I would consider using the DATE type instead of separate columns for year, month, and day. Then you can use DATEADD and related functions to find the day you want.

http://dev.mysql.com/doc/refman/5.1/en/datetime.html

http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html