definition:
DATEPART function to return a part of the specified date.
grammar:
DATEPART(datepart,date)
parameter:
① the datepart of a parameter can be the following values:
| datepart | abbreviation |
|---|---|
| Year (Year) | YEAR, YY, YYYY |
| Quarter (Quarter) | Q, QQ, QUARTER |
| May (Month) | M, MM, MONTH |
| On the day (Day of year) | DAYOFYEAR, DY, Y |
| Day (Day) | D, DAY, DD |
| Week (Week) | WEEK, WK, WW |
| Week (Weekday) | DW, W, WEEKDAY |
| ISO week | ISO_WEEK, ISOWK, ISOWW |
| Time zone offset | TZ TZOFFSET |
| Hour (Hour) | HH, HOUR |
| Min (Minute) | MI, MINUTE, N |
| S (Second) | S, SECOND, SS |
| Ms (Millisecond) | MILLISECOND, MS |
| Subtle (Microsecond) | MCS, MICROSECOND |
| Nanoseconds (Nanosecond) | NANOSECOND, NS |
② DATE parameter is valid date expression.
return value:
int data type
Example:
※ Sunday - Saturday correspond 1-7