转:Oracle greatest函数
格式:
greatest( expr1, expr2, ... expr_n )
expr1, expr2, . expr_n 可以值也可以是函数.
函数功能:
取得值最大值。
影响版本:
Oracle 8i, Oracle 9i, Oracle 10g, Oracle 11g
例子:
greatest(2, 5, 12, 3) would return 12
greatest('2', '5', '12', '3') would return '5'
greatest('apples', 'oranges', 'bananas') would return 'oranges'
greatest('apples', 'applis', 'applas') would return 'applis'