Liu Chuang (snooker player) Liu Chuang (snooker player) Liu Chuang (Chinese: 刘闯, pinyin: Liú Chuǎng, born 6 June 1990) is a Chinese former professional snooker player. Liu grew up in Liaoning province in northeast China. Near his parents' house there was a snooker table and when he was 10 he played on it and liked it a lot. His father noticed his potential, and supported him as did the person who owned that table, who became his first coach. When he was 13, Liu travelled thousands of miles to play in southern China, where there were more professionals. There he improved and began to
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