Conditional

Function Name	Description
BOOL_AND	Computes the boolean AND of two boolean expressions. Returns TRUE if both expressions evaluate to TRUE. Returns FALSE if one or both expression(s) evaluate(s) to FALSE.
BOOL_OR	Computes the boolean OR of two boolean expressions. Returns TRUE if one or both expressions evaluate to TRUE. Returns FALSE if both expressions evaluate to FALSE.
CASE	Evaluates a list of conditions and returns the first resulting true expression. If a true expression is not found, will return the ELSE statement, if present, or else will return NULL.
COALESCE	Evaluates the arguments in order and returns the value of the first expression that does not contain NULL.
GREATEST	Returns the largest value from a list of expressions.
LEAST	Returns the smallest value from a list of expressions.
NULLIF	Compares two expressions. If the values in each expression are equal, returns NULL and, if they are not equal, returns the value of the first expression.