Unions are useful for minimizing memory usage for exclusive data, such as when implementing mixed data types.
struct AnyType {
enum {
IS_INT,
IS_FLOAT
} type;
union Data {
int as_int;
float as_float;
} value;
AnyType(int i) : type...
SELECT E.EMPLOYEE_ID,E.LAST_NAME,E.MANAGER_ID FROM HR.EMPLOYEES E
CONNECT BY PRIOR E.EMPLOYEE_ID = E.MANAGER_ID;
The CONNECT BY clause to define the relationship between employees and managers.
Deconstructing the use of an unsafe pointer in the Swift library method;
public init?(validatingUTF8 cString: UnsafePointer<CChar>)
Purpose:
Creates a new string by copying and validating the null-terminated UTF-8 data referenced by the given pointer.
This initializer does not try to rep...