is there any need to index b again as it is already a under primary

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is there any need to index b again as it is already a under primary- if primary(a,b) and in query we have where b=' '; is there any need to index(b) again individually because while indexing it will take left column first then thinks of the next. thanks in advance and please help me out of this

asked 3 mins ago

user3713839

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