-- 2. Note the INNER JOIN misses the teachers with no department and the departments with no teacher SELECT teacher.name, dept.name FROM teacher INNER JOIN dept ON (teacher.dept=dept.id); -- 3. Use a ...
Abstract: The lack of information within relational databases expressed as NULL values presents a problem in ensuring the quality of data and the information retrieved by SQL queries. This is so ...
According to the ANSI standards SQL:92, SQL:1999, and SQL:2003, a UNIQUE constraint should disallow duplicate non-NULL values, but allow multiple NULL values. SQL Server has always implemented a ...
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