3 ms·
In MySQL, NULL values are useful when using CONCAT_WS (concatenation with separator) or GROUP_CONCAT because NULL values will be ignored - so you don’t get e.g.
by lesserknowndan 7y ago
In MySQL, NULL values are useful when using CONCAT_WS (concatenation with separator) or GROUP_CONCAT because NULL values will be ignored - so you don’t get e.g., “one,,two”.