sqlite - Sqlite3中时间戳之间的秒数差异

Question

是否有可能获得 Sqlite3 中两个 TIMESTAMP 值之间的差异（以秒为单位）？

例如，我尝试了以下查询：

SELECT CURRENT_TIMESTAMP - my_timestamp FROM my_table;

我总是得到'0'。谁能告诉我我做错了什么？（注意，我已经验证 my_timestamp 确实是过去的。）

Answer 1

Got it:

SELECT (julianday(CURRENT_TIMESTAMP) - julianday(my_timestamp)) * 86400.0) FROM my_table;

julianday returns the fractional number of days since noon in Greenwich on November 24, 4714 B.C. I then take the difference and multiply by the number of seconds per day.

Answer 2

最接近秒的另一种变体

CAST(strftime('%s', CURRENT_TIMESTAMP) as integer) - 
CAST(strftime('%s', my_timestamp) as integer)