Instead of :
WHERE cd='ca' ORDER BY l_postcode;
Write :
WHERE cd='ca' ORDER BY cd, l_postcode;
You have a multicolumn index, so you should specify a multicolumn sort exactly the same as your index, and the planner will get it.
Instead of :
WHERE cd='ca' ORDER BY l_postcode;
Write :
WHERE cd='ca' ORDER BY cd, l_postcode;
You have a multicolumn index, so you should specify a multicolumn sort exactly the same as your index, and the planner will get it.
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