The UNION operator is used to combine the result-set of two or more SELECT statements . Every SELECT statement within UNION must have the same number of columns. The columns must also have similar data types. The columns in every SELECT statement must also be in the same order.
Read moreWhat is the use of union?
The primary use of a union is allowing access to a common location by different data types , for example hardware input/output access, bitfield and word sharing, or type punning. Unions can also provide low-level polymorphism.
Read moreWhat is the union in C?
C Union. Union is an user defined datatype in C programming language . It is a collection of variables of different datatypes in the same memory location. We can define a union with many members, but at a given point of time only one member can contain a value.
Read moreWhat is union in C give example?
A union is a user-defined type similar to structs in C except for one key difference . Structures allocate enough space to store all their members, whereas unions can only hold one member value at a time.
Read moreWhat are structures and unions in C?
Structure is the container defined in C to store data variables of different type and also supports for the user defined variables storage. On other hand Union is also similar kind of container in C which can also holds the different type of variables along with the user defined variables.
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