Snooker surroundings or in public snooker halls. The game can also be played on smaller tables using fewer red balls. The variants in table size are: 10 ft × 5 ft, 9 ft × 4.5 ft, 8 ft × 4 ft, 6 ft × 3 ft (the smallest for realistic play) and 4 ft × 2 ft. Smaller tables can come in a variety of styles, such as fold-away or dining-table convertible. A traditional snooker scoreboard resembles an abacus, and records units, tens and hundreds via horizontal sliding pointers. They are typically attached to a wall by the snooker table. A
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