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If you use group by , the select( min(coins_needed) ....query will return multiple rows and not a single value.
So, we can't write a condition such as : where coins_needed=select(min(coins_needed) ... group by...) because of multiple rows problem.
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If you use group by , the select( min(coins_needed) ....query will return multiple rows and not a single value. So, we can't write a condition such as : where coins_needed=select(min(coins_needed) ... group by...) because of multiple rows problem.