( NOTE : ABOVE ADVANTAGE IS WE CAN DISPLAY ONLY WHAT WE NEED THAT THINGS ONLY WE CAN ADD TO QUERY BUT ALL THE INNER QUERIES ARE EXECUTED BUT WE CAN RESTRICT WHAT DISPLAY IN OUTER SUBQUERY) ...
A common SQL habit is to use SELECT * on a query, because it’s tedious to list all the columns you need. Plus, sometimes those columns may change over time, so why not just do things the easy way? But ...
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