Oracle 11G函数整理(一般比较函数)

1、GREATEST(ch)  ch为英文逗号隔开的字符串，返回字符串中最大的一个

select GREATEST(1,2,3,4) a1 from dual;

select GREATEST('ABC','ABA','ABB','AAA') a1 from dual;

select GREATEST(sysdate,sysdate+1,sysdate-1) a1 from dual;

 

2、LEAST(ch)  ch为英文逗号隔开的字符串，返回字符串中最小的一个

select LEAST(1,2,3,4) a1 from dual;

select LEAST('ABC','ABA','ABB','AAA') a1 from dual;

select LEAST(sysdate,sysdate+1,sysdate-1) a1 from dual;