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Using DISTINCT in SQL
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=aE-NwBnsyDQ
A brief beginner's introduction to the DISTINCT operator in SQL. DISTINCT creates a set of unique records, based on field values. In other words, duplicates records, based on field values, are removed. DISTINCT is often used with COUNT, to achieve a count of distinct values. Be aware that NULL is treated as a distinct value in terms of records, but COUNT ignores NULLs. • See the full code here: https://douglaskline.blogspot.com/201...
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