PostgreSQL时间运算

转载地址:http://blog.csdn.net/dante_k7/article/details/5718712

在PostgreSQL中可以直接对timestamp进行加减运算：

timestamp + interval

SELECT now()::timestamp + '1 year';
SELECT now()::timestamp + '1 month';
SELECT now()::timestamp + '1 day';
SELECT now()::timestamp + '1 hour';
SELECT now()::timestamp + '1 min';
SELECT now()::timestamp + '1 sec';
select now()::timestamp + '1 year 1 month 1 day 1 hour 1 min 1 sec';
SELECT now()::timestamp + (col || ' day')::interval FROM table