how to effectively get the current timestamp
how to effectively get the current timestamp
ISODate().valueOf();result:
1540530928417 mongodb is the js, timestamp  new Date (). GetTime () . There is no difference 
Boss database has a user table with an IP field in it. How can I find out all the data with duplicate IP in this table? ...
as shown in the figure above, how to determine the existence of the value of "Ltd. Ed. Elitist " 1964 "Texan " in the specification object ...