Oracle中DATEADD()的等效函数

I have to get a date that is 6 months from the system date in Oracle.
And I have to get it by running an open-query from SQL. DATEADD(MONTH,-6, GETDATE()) function serves the purpose in SQL.

Does the function DATEADD(MONTH,-6, GETDATE()) in SQL have an equivalent function in Oracle?

我必须得到一个日期，从Oracle中的系统日期起6个月。我必须通过运行SQL的开放查询来获得它。DATEADD(MONTH，-6, GETDATE())函数用于SQL。SQL中的DATEADD(MONTH，-6, GETDATE())函数在Oracle中是否具有相同的功能?

3 个解决方案

#1

Method1: ADD_MONTHS

Method1:ADD_MONTHS

ADD_MONTHS(SYSDATE, -6)

ADD_MONTHS(SYSDATE,6)

Method 2: Interval

方法2:间隔

SYSDATE - interval '6' month

SYSDATE - interval '6'月。

Note: if you want to do the operations from start of the current month always, TRUNC(SYSDATE,'MONTH') would give that. And it expects a Date datatype as input.

注意:如果您希望从当前月开始执行操作，TRUNC(SYSDATE，' month ')会给出这个结果。它需要一个日期数据类型作为输入。

#2

Equivalent will be

相当于将

ADD_MONTHS( SYSDATE, -6 )

#3

Not my answer :

不是我的回答:

I wasn't too happy with the answers above and some additional searching yielded this :

我对上面的答案不太满意，一些额外的搜索结果是:

SELECT SYSDATE AS current_date,

       SYSDATE + 1 AS plus_1_day,

       SYSDATE + 1/24 AS plus_1_hours,

       SYSDATE + 1/24/60 AS plus_1_minutes,

       SYSDATE + 1/24/60/60 AS plus_1_seconds

FROM   dual;

which I found very helpful. From http://sqlbisam.blogspot.com/2014/01/add-date-interval-to-date-or-dateadd.html

我觉得很有帮助。从http://sqlbisam.blogspot.com/2014/01/add-date-interval-to-date-or-dateadd.html

#1