Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind SQL Server DATEDIFF() Function?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
2Fill blank
Complete the missing token from the example code.
___ DATEDIFF(year, '2017/08/25', '2011/08/25') AS DateDiff;3Order
Put the learning moves in the order that makes the concept easiest to apply.
The DATEDIFF() function returns the difference between two dates, as an integer.
Definition and Usage
SQL Server DATEDIFF() Function
Example
SELECT DATEDIFF(year, '2017/08/25', '2011/08/25') AS DateDiff;Definition and Usage
The DATEDIFF() function returns the difference between two dates, as an integer.
Syntax
DATEDIFF(
interval
,
date1
,
date2
)Parameter Values
| Parameter | Description |
|---|---|
| interval | Required. The part to return. Can be one of the following values: year, yyyy, yy = Year quarter, qq, q = Quarter month, mm, m = month dayofyear = Day of the year day, dy, y = Day week, ww, wk = Week weekday, dw, w = Weekday hour, hh = hour minute, mi, n = Minute second, ss, s = Second millisecond, ms = Millisecond |
| date1, date2 | Required. The two dates to calculate the difference between |
- year, yyyy, yy = Year
- quarter, qq, q = Quarter
- month, mm, m = month
- dayofyear = Day of the year
- day, dy, y = Day
- week, ww, wk = Week
- weekday, dw, w = Weekday
- hour, hh = hour
- minute, mi, n = Minute
- second, ss, s = Second
- millisecond, ms = Millisecond
Technical Details
| Return type: | int |
|---|---|
| Works in: | SQL Server (starting with 2008), Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse |