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I have read the document already but i do not fully understand The default precision is datetime2(7) is 7 represent the precision of nanosecond?
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No, the number represents the number of digits preserved after the decimal point for the seconds. 3 would be millisecond, 6 microsecond and 7 equivalent to a precision of 100 nanoseconds.
The resolution of the default precision (7)
datetime2type is 100 nanoseconds.An excellent reference for things date/time is : The ultimate guide to the datetime datatypes