#select timestamp '2002-12-20' - timestamp '2001-01-01';
?column?
----------
718 days
(1 row)# select now() - interval '30 days';
?column?
-------------------------------
2002-11-20 09:55:35.613223+08
(1 row)明白了么?
?column?
----------
718 days
(1 row)# select now() - interval '30 days';
?column?
-------------------------------
2002-11-20 09:55:35.613223+08
(1 row)明白了么?
解决方案 »
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