It seems to me that you have a flawed design.
You should just have a 2 column database to begin with, with a table like this:
Code Count
a 4
b 2
c 3
Rather than plain inserting or deleting rows, just sometimes insert
or delete, you should instead increment or decrement counts, adding a
row if its the first instance of the code, and removing the row if it
would decrement to zero.
Displaying sparse like that should be a function of your application
display code, not the database, and it can easily do that using a
simple for-loop or something for each fetched row, iterating on the
count.
-- Darren Duncan
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