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grouping by the first expression you have at the select option
so if you do select a,b,c
grouping by 2,1
will give you groups in the order of b,a and the c expressions according to these groups
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grouping by the first expression you have at the select option so if you do select a,b,c grouping by 2,1 will give you groups in the order of b,a and the c expressions according to these groups