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Does SQL Server support IS DISTINCT FROM statement which is SQL:1999 standard? E.g. the query
SELECT * FROM Bugs WHERE assigned_to IS NULL OR assigned_to <> 1;
can be rewritten using IS DISTINCT FROM
SELECT * FROM Bugs WHERE assigned_to IS DISTINCT FROM 1;
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The SQL Server (Transact-SQL) DISTINCT clause is used to remove duplicates from the result set. The DISTINCT clause can only be used with SELECT statements.
SQL DISTINCT clause is used to remove the duplicates columns from the result set. The distinct keyword is used with select keyword in conjunction. It is helpful when we avoid duplicate values present in the specific columns/tables. The unique values are fetched when we use the distinct keyword.
By using the WHERE clause with a DISTINCT clause in MySQL queries, we are putting a condition on the basis of which MySQL returns the unique rows of the result set.
SQL Server doesn't support the USING clause, so you need to use the ON clause instead. The USING clause can be used with INNER, LEFT, RIGHT, and FULL JOIN statements.
No, it doesn't. The following SO question explains how to rewrite them into equivalent (but more verbose) SQL Server expressions:
There's also a Uservoice entry for this issue, where you can vote for inclusion in the next release:
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