Mysql中的from_unixtime,unix_timestamp 整型与datetime 字符串之间的转换
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select from_unixtime(lasttalktime),lasttalktime from im_ims_friend
select unix_timestamp('2013-10-13')
select count(*) from im_ims_friend where lasttalktime>unix_timestamp('2013-10-13')
select count(*) from im_ims_friend_copy where lasttalktime>unix_timestamp('2013-10-28') and userid=6736359
INSERT INTO im_ims_friend SELECT * FROM im_ims_friend_copy where lasttalktime>unix_timestamp('2013-10-20')
select unix_timestamp('2013-10-13')
select count(*) from im_ims_friend where lasttalktime>unix_timestamp('2013-10-13')
select count(*) from im_ims_friend_copy where lasttalktime>unix_timestamp('2013-10-28') and userid=6736359
INSERT INTO im_ims_friend SELECT * FROM im_ims_friend_copy where lasttalktime>unix_timestamp('2013-10-20')
delete FROM im_ims_friend where lasttalktime>unix_timestamp('2013-10-20') and lasttalktime<unix_timestamp('2013-10-23')
select
from_unixtime(1210003200) datetime
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