Does the order of columns matter in a group by clause?

Question

If I have two columns, one with very high cardinality and one with very low cardinality (unique # of values), does it matter in which order I group by?

Here\'s an ex

Answer 1

If I have two columns, one with very high cardinality and one with very low cardinality (unique # of values), does it matter in which order I group by?

Query-1

SELECT spec_id, catid, spec_display_value, COUNT(*) AS cnt  FROM tbl_product_spec 
GROUP BY spec_id, catid, spec_display_value ;

Query-2

SELECT spec_id, catid, spec_display_value, COUNT(*) AS cnt  FROM tbl_product_spec FORCE INDEX(idx_comp_spec_cnt)
GROUP BY catid, spec_id,spec_display_value;

Both are equal , order doesn't work in group by clause.