In SQL, the function of the union operator is to combine the result of two or more select-statements. The union operator is a very useful tool when coding SQL.
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T-SQL is Microsoft's version of the generic SQL langauge to be used with, for example, Microsoft SQL Server.
That depends! The identity operator must map something from a space X to a space Y. This mapping might be continuous - which is the case if the identify operator is bounded - or discontinuous - if the identity operator is unbounded.
The coalesce function returns the first expression that contains the highest in data precedence. If all other expressions are considered 'nonnullable, then the result will be labelled nonnullable as well.
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