Question
in SQL, can you set a column that allows null values to be unique? What happens if the table contains multiple rows with null value
in SQL, can you set a column that allows null values to be unique? What happens if the table contains multiple rows with null value for that column? What happens in case you specify a foreign key to that column in another table and a tuple in the referencing table contains a null value for the foreign key?
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Database Application Development And Design
Authors: Michael V. Mannino
1st Edition
0072463678, 978-0072463675
