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Showing content with the highest reputation on 10/18/2021 in Posts

  1. The DISTINCT modifier doesn't apply to fields, it applies to the query as a whole. You can think of "SELECT DISTINCT" as a single keyword which searches for unique rows. The AND operator will return a row only if both conditions are true. The OR operator will return a row if either one of the conditions is true. The query is looking for rows where Country is not Germany AND also Country is not USA. If you used OR instead then it would return all of the rows. The expression (NOT Country='Germany') means "all possible values except Germany" The expression (NOT Country='USA') means "all possible values except USA" The union [OR] of those two sets is all possible values, because any value that one of the sets lacks exists in the other set.
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