mysql explode data count
Mon Sep 18 2023 19:14:58 GMT+0000 (Coordinated Universal Time)
Saved by @raca12
SELECT SUBSTRING_INDEX(promosyon_kod, '-', 1) promosyon_kod FROM promosyon group by SUBSTRING_INDEX(promosyon_kod, '-', 1)
https://stackoverflow.com/questions/12865411/group-by-partial-string
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