Indexes can be unique or nonunique. Unique indexes guarantee that no two rows of a table have duplicate values in the key column or columns. For example, no two employees can have the same employee ID. Thus, in a unique index, one rowid exists for each data value. The data in the leaf blocks is sorted only by key.
Energy exists in many different forms. Examples of these are: light energy, heat energy, mechanical energy, gravitational energy, electrical energy, sound energy, chemical energy, nuclear or atomic energy and so on. These forms of energy can be transferred and transformed between one another.
God gave us several forms of natural. energy to help us live productively on earth. He gave man the intelligence to learn. how to use different forms of energy in creative ways. During this unit we will. examine different energy types: God is the creator of the world and the producer of. all its whole being or substances, including these energy types (Psalms 19:3-6). Everything that moves requires energy. The types of energy are listed in the. illustration.