Indoor games and sports is captured and removed from the board. The object of the game is to trap (checkmate) the enemy king by putting it in a position where it cannot escape capture. Various indoor games, including billiards, snooker and pool, are played on a large, flat, cloth-covered table with six pockets. In these games, each of the two players tries to pot the balls (knock them into the pockets) by striking them with a cue-ball, which is hit with the tip of a stick called a cue. In "billiards", there are just three balls: a white cue-ball for each player and one
Many-to-many (data model) Many-to-many (data model) In systems analysis, a many-to-many relationship is a type of cardinality that refers to the relationship between two entities A and B in which A may contain a parent instance for which there are many children in B and vice versa. For example, think of A as Authors, and B as Books. An Author can write several Books, and a Book can be written by several Authors. In a relational database management system, such relationships are usually implemented by means of an associative table (also known as junction table or "cross-reference table"), say, AB with two one-to-many