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Unions and enums are two essential user-defined types in C that provide memory efficiency and code clarity, respectively. Union Declaration and Memory Layout A union groups multiple variables of different types into a single memory location. The compiler allocates enough memory to hold the largest member. All member share the same starting addr ...

Recursive Common Table Expressions (CTEs) in SQL Server can be combnied with other queries using the UNION or UNION ALL operators. This is typically done within the recursive CTE definition itself, where the anchor member and the recursive member are joined by a UNION ALL. The final result set of the CTE can then be used in an outer query with ...