正确写法:
SELECT scan_time + (5 || ' day')::interval FROM tbl_temp_record
SELECT scan_time + ('-' || 5 || ' day')::interval FROM tbl_temp_record
或
SELECT scan_time + 5*interval '1 day' FROM tbl_temp_record
SELECT scan_time + 5*interval '-1 day' FROM tbl_temp_record
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原文链接:https://blog.csdn.net/r_rcgz/article/details/53171256