碰巧看到一篇文章提到了Oracle的greatest函数,相对应的有个least,以为这俩是个新的函数,但是看了下官方文档,其实在11g的《SQL Language Reference》,就提到了他们,是我孤陋寡闻了。 从函数的名称上,能猜到这两个函数分别求的是最大值和最小值。 greatest函数介绍, GREATEST returns the greatest of a list of...
Purpose of the SQL GREATEST and LEAST Function The SQL GREATEST function returns the“greatest” or largest value in a set of valuesthat you provide to it. The SQL LEAST function returns the“least” or smallest value in a set of valuesthat you provide to it, and it’s the opposite of ...
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GREATEST returns the greatest of a list of one or more expressions. Oracle Database uses the first expr to determine the return type. If the first expr is numeric, then Oracle determines the argument with the highest numeric precedence, implicitly converts the remaining arguments to that data t...
(2,1): 2 GREATEST('2',1,0): 2 GREATEST('a','b','c'): c GREATEST('a', NULL, 'c'): NULL GREATEST('2014-05-15','2014-06-01'): 2014-06-01 1 row in set obclient> SELECT GREATEST(2); ERROR 1582 (42000): Incorrect parameter count in the call to native function '...
Oracle SQL: the Essential Reference by David C. Kreines Buy on Amazon GREATEST GREATEST(expr[,expr...]) Returns the highest value from the list of arguments supplied. The GREATEST function can be used with character strings and dates, as well as with numbers. ...
FROM DUAL; Greatest --- HARRY 次の文では、最初の引数は数字です。Oracle Databaseは、数値の優先順位が最も高い引数は2番目の引数であると判断し、残りの引数を2番目の引数のデータ型に変換して、そのデータ型で最大値を戻します。 SELECT GREATEST...
"greatest-n-per-group"问题是指在Oracle数据库中,对于每个分组,找出最大的N个值的问题。这个问题与标准SQL的主要区别在于,标准SQL中的GROUP BY子句通常用于聚合数据,而Oracle提供了一些特定的函数和子句来解决这个问题。 在Oracle中,可以使用ROW_NUMBER()窗口函数结合子查询来实现这个功能。例如,假设我们有一个名为...
The greatest function is a powerful tool for anyone looking to find the largest value in a set of data. It can be used to find the maximum value in an array, the maximum number in a set of numbers, or the highest score in a game. The greatest function is fairly easy to use. All...
2,1): 2 GREATEST('2',1,0): 2 GREATEST('a','b','c'): c GREATEST('a', NULL, 'c'): NULL GREATEST('2014-05-15','2014-06-01'): 2014-06-01 1 row in set obclient> SELECT GREATEST(2); ERROR 1582 (42000): Incorrect parameter count in the call to native function 'greatest...