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Difference between UNION and UNION ALL operators in MySQL.
In MySQL UNION operator used to combine the result of multiple SELECT statements. When we apply the UNION operator then it selects only distinct values by default (No duplicate values are allowed).
UNION Operator
When we apply UNION operato...
Difference between structure and union in c
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union in C
A union is a special data type available in C that allows to store different data types in the same memory location just like structures in C.
Union uses a single shared memory location which is equal to the size of its largest data member. It...
