sql语句
SELECT EXTRACT(EPOCH FROM (TIMESTAMP '2017-12-16 12:21:13'- TIMESTAMP '2017-12-15 12:21:00'));
=>
86413
计算两个时间的差值更新另一个时间字段
UPDATE your_table
SET this_time=(EXTRACT(EPOCH FROM (time_a-time_b)));
PostgreSQL得出两个timestamp的秒数差值
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转载自blog.csdn.net/housonglin1213/article/details/101509476
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