PostgreSQL 13に週の加算のサンプル
書式
週の加算
日付 + cast( 'xx weeks’ as INTERVAL )
環境
Windows10 64 bit
PostgreSQL 13.2
使用例
1.現在時刻に8週加えます
postgres=# select now() + cast('8 weeks' as INTERVAL) result; result ------------------------------- 2022-03-05 22:00:39.215478+09 (1 行)
2.「2022/1/2」に8週加えます
postgres=# select cast('2022/1/2' as date) + cast('8 weeks' as INTERVAL) result; result --------------------- 2022-02-27 00:00:00 (1 行)
3.「2022/1/2 18:00:12」に8週加えます
postgres=# select cast('20220102 18:00:12' as timestamp) + cast('8 weeks' as INTERVAL) result; result --------------------- 2022-02-27 18:00:12 (1 行)