Nullability is a concept that occasionally causes consternation among SQL developers, especially new ones. It is a somewhat controversial construct and some believe relational databases should not allow NULLs at all. (See C.J. Date) Like it or not, the concept made it into the relational model and we might as well take advantage of it where possible. Imagine a table that contains parts of a...
Eliminating Redundant Delimiters with NULL
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