php - copy A table to B table with extra unique column -


in database have 2 table , orders , cart , copy cart table order table can using statement 

insert orders  select *, current_timestamp()    cart

the current_timestamp() replace unique column don't want use timestamp unique , have else , because scared 2 user order in same time , have same order id

you can use current date , time epoch format uniqueness of record.

for example :-

assuming 1501216777000 in milliseconds: gmt: friday, july 28, 2017 4:39:37.216 time zone: friday, july 28, 2017 10:09:37.216 gmt+05:30

so 1501216777000 string can unique. 2 users can not place order in same time because epoch format in milliseconds.


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