I am using a MySql table with 500,000 records. The table contains a field (abbrevName) which stores a two-character representation of the first two letters on another field, name.
For example AA AB AC and so on.
What I want to achieve is the set the value of another field (pgNo) which stores a value for page number, based on the value of that records abbrevName.
So a record with an abbrevName of 'AA' might get a page number of 1, 'AB' might get a page number of 2, and so on.
The catch is that although multiple records may have the same page number (after all multiple entities might have a name beginning with 'AA'), once the amount of records with the same page number reaches 250, the page number must increment by one. So after 250 'AA' records with a page number of 1, we must assign futher 'AA records with a page number of 2, and so on.
My Pseudocode looks something like this:
-Count distinct abbrevNames
-Count distinct abbrevNames with more than 250 records
-For the above abbrevNames count the the sum of each divided by 250
-Output a temporary table sorted by abbrevName
-Use the total number of distinct page numbers with 250 or less records to assign page numbers incrementally
I am really struggling to put anything together in a query that comes close to this, can anyone help with my logic or some code ?