difference between union and union all

If two sets are given, a set can be formed by using all the elements of the two sets. Such a collection is called the union of the given set..

State whether the expression { x : x < 3} or { x : x > 10} represents an intersection or union of sets. => disjunction or union or intersection or conjunction..

Union of sets - If two sets are given, a set can be formed by using all the elements of the two sets. Such a collection is called the union of the given set..

The pollen grains which produce the male gametes and the ovules which bear the female gametes are borne on different structures. It therefore becomes necessary that for sexual union to occur, the pollen grains must be transferred to the stigma. The transfer and deposition of pol..

A method known as the Geneva system was suggested in 1892 by the International Chemical Congress at Geneva for naming organic compounds. Later the International Union of Chemistry at Liege (Belgium) developed it into IUPAC system of nomenclature in 1930. In 1958, the IUPAC system was mod..

A joint or articulation is the term used to describe the union of any two or more, bones of the skeleton. The term arthrology is applied to the study of joints. There are three main classes of joints namely, fibrous, cartilaginous and synovial joint..

Nomenclature is the system of naming. With the existence of innumerable compounds of carbon, it has become necessary to follow a universal, rational system of naming. Such a system has been evolved by International union of pure and applied chemistry (IUPAC). By following this system, we ..

Many animal species have either become extinct or are on the verge extinction. This is because of continuous and constant exploitation by man. The International Union for Conservation of Nature and Natural resources (IUCN) have printed out five main conservation categories of wild animal ..

Nomenclature of Hydrocarbons - Nomenclature is the system of naming. With the existence of innumerable compounds of carbon, it has become necessary to follow a universal, rational system of naming. Such a system has been evolved by International union of pure and applied chemistry (IUPAC)..

All elements beyond uranium (Z=92) are synthesized in the laboratories and are known as 'trans uranium elements'. The elements, beyond fermium (Z=100) are known as 'trans fermium elements'. These elements have atomic numbers 101 onwards. Elements like fermium (Z=100), mendelevium (Z=101), nobelium ..