Kiu kiu Kiu kiu Kiu kiu or qiu qiu is a form of dominoes popular in Indonesia related to pai gow. It may also be referred to as '99 domino poker'. It is played using a set of (28) double-six dominoes, which in Indonesia typically take the form of small cards, which are discarded after a few games as they show signs of wear. Players are typically required to pay a fixed ante into a pot, and are then dealt three domino cards. After evaluating their cards each player in turn may either bet (if there is no previous bettor), call (if
Unique key According to the SQL standard a unique constraint does not enforce uniqueness in the presence of nulls and can therefore contain several rows with identical combinations of nulls and non-null values — however not all RDBMS implement this feature according to the SQL standard. Unique key In database relational modeling and implementation, a unique key (also known as a candidate key) of a relation is a minimal superkey for that relation; that is, a set of attributes such that: When a column or set of columns is defined as unique to the database management system, the system verifies that each