Trafodion的dateadd函数用法：
DATEADD(datepart, num-expr,datetime-expr)
Datepart：YEAR,MONTH, DAY, HOUR, MINUTE, SECOND, QUARTER, WEEK。
num-expr：正数、负数均可以。正数表示在原有日期上做加法，负数表示在原有日期上做减法。
datetime-expr：给定的DATE或者TIMESTAMP类型的值。
应用示例：
--2017-12-22的前一天
SQL>select DATEADD(DAY, -1 , DATE'2017-12-22') from dual;
(EXPR)
----------
2017-12-21
--- 1 row(s) selected.
SQL>select DATEADD(DAY, -1,timestamp'2017-12-22 00:00:00') from dual;
(EXPR)
-------------------
2017-12-21 00:00:00
--- 1 row(s) selected.
--2017-12-22的下一天
SQL>select DATEADD(DAY, 1 , DATE'2017-12-22') from dual;
(EXPR)
----------
2017-12-23
--- 1 row(s) selected.
SQL>select DATEADD(DAY, 1,timestamp'2017-12-22 00:00:00') from dual;
(EXPR)
-------------------
2017-12-23 00:00:00
--- 1 row(s) selected.
--2017-12-22的上一个月的同一天
SQL>select DATEADD(MONTH, -1 , DATE'2017-12-22') from dual;
(EXPR)
----------
2017-11-22
--- 1 row(s) selected.
SQL>select DATEADD(MONTH, -1,timestamp'2017-12-22 00:00:00') from dual;
(EXPR)
-------------------
2017-11-22 00:00:00
--- 1 row(s) selected.
--2017-12-22的下一个月的同一天
SQL>select DATEADD(MONTH, 1 , DATE'2017-12-22') from dual;
(EXPR)
----------
2018-01-22
--- 1 row(s) selected.
SQL>select DATEADD(MONTH, 1,timestamp'2017-12-22 00:00:00') from dual;
(EXPR)
-------------------
2018-01-22 00:00:00
--- 1 row(s) selected.
--2017-12-22的上一年的同一天
SQL>select DATEADD(YEAR, -1 , DATE'2017-12-22') from dual;
(EXPR)
----------
2016-12-22
--- 1 row(s) selected.
SQL>select DATEADD(YEAR, -1,timestamp'2017-12-22 00:00:00') from dual;
(EXPR)
-------------------
2016-12-22 00:00:00
--- 1 row(s) selected.
--2017-12-22的下一年的同一天
SQL>select DATEADD(YEAR, 1 , DATE'2017-12-22') from dual;
(EXPR)
----------
2018-12-22
--- 1 row(s) selected.
SQL>select DATEADD(YEAR, 1,timestamp'2017-12-22 00:00:00') from dual;
(EXPR)
-------------------
2018-12-22 00:00:00
--- 1 row(s) selected.
--linux类型的时间戳1500220712转为trafodion的timestamp
SQL>selectdateadd(SECOND,1500220712,timestamp '1970-01-01 00:00:00') from dual;
(EXPR)
---------------------
2017-07-16 15:58:32.0
--- 1 row(s) selected.