格式:MONTHS_BETWEEN(DATE1,DATE2) MONTHS_BETWEEN函数返回两个日期之间的月份数. SQL> ', 'yyyymmdd')) as months from dual; MONTHS ---------- SQL> ', 'yyyymmdd')) as months from dual; MONTHS ---------- SQL> ', 'yyyymmdd')) as months from dual; MONTHS ---------- SQL&g…
Oracle中函数/过程返回结果集的几种方式: 以函数return为例,存储过程只需改为out参数即可,在oracle 10g测试通过. (1) 返回游标: return的类型为:SYS_REFCURSOR 之后在IS里面定义变量:curr SYS_REFCURSOR; 最后在函数体中写: open cur for select ......; return cur; 例: CREATE OR REPLACE FUNCTION A_Te…
常用的语法:select--from--where--group by--having--order by 1.分组子句group by +con 按什么分组 2.having子句 对上面分组的数据进行再次条件过滤 3.排序子句 order by order by + con ASC 升序 order by + con desc j降序 select con1 ,con2 from ......+ order by 1 按con1排序/+ order by 2 按con2排…