Indexes is a good idea but I already have the relevant columns already indexed. The count is there to sequence the same brands like:
id brand rank=(count*)
1 A 1
2 B 1
3 A 2
4 A 3
5 B 2
etc. That way the dates from consecutive brand appearances can be compared by the rank=rank+1 for the datediff() comparison. There already is an autoincrement id column but it can't be used for comparing consecutive dates of the same brand.
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