Find difference in months between now and EndDate : DATEDIFF « Date Functions « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Date Functions » DATEDIFF 
10. 4. 14. Find difference in months between now and EndDate
14>
15CREATE TABLE employee(
16>    id          INTEGER NOT NULL PRIMARY KEY,
17>    first_name  VARCHAR(10),
18>    last_name   VARCHAR(10),
19>    salary      DECIMAL(10,2),
20>    start_Date  DATETIME,
21>    region      VARCHAR(10),
22>    city        VARCHAR(20),
23>    managerid   INTEGER
24);
25> GO
1INSERT INTO employee VALUES (1'Jason' ,  'Martin', 5890,'2005-03-22','North','Vancouver',3);
2> GO

(rows affected)
1INSERT INTO employee VALUES (2'Alison',  'Mathews',4789,'2003-07-21','South','Utown',4);
2> GO

(rows affected)
1INSERT INTO employee VALUES (3'James' ,  'Smith',  6678,'2001-12-01','North','Paris',5);
2> GO

(rows affected)
1INSERT INTO employee VALUES (4'Celia' ,  'Rice',   5567,'2006-03-03','South','London',6);
2> GO

(rows affected)
1INSERT INTO employee VALUES (5'Robert',  'Black',  4467,'2004-07-02','East','Newton',7);
2> GO

(rows affected)
1INSERT INTO employee VALUES (6'Linda' ,  'Green' , 6456,'2002-05-19','East','Calgary',8);
2> GO

(rows affected)
1INSERT INTO employee VALUES (7'David' ,  'Larry',  5345,'2008-03-18','West','New York',9);
2> GO

(rows affected)
1INSERT INTO employee VALUES (8'James' ,  'Cat',    4234,'2007-07-17','West','Regina',9);
2> GO

(rows affected)
1INSERT INTO employee VALUES (9'Joan'  ,  'Act',    6123,'2001-04-16','North','Toronto',10);
2> GO

(rows affected)
1>
2select from employee;
3> GO
id          first_name last_name  salary       start_Date              region     city                 managerid
----------- ---------- ---------- ------------ ----------------------- ---------- -------------------- -----------
          Jason      Martin          5890.00 2005-03-22 00:00:00.000 North      Vancouver                      3
          Alison     Mathews         4789.00 2003-07-21 00:00:00.000 South      Utown                          4
          James      Smith           6678.00 2001-12-01 00:00:00.000 North      Paris                          5
          Celia      Rice            5567.00 2006-03-03 00:00:00.000 South      London                         6
          Robert     Black           4467.00 2004-07-02 00:00:00.000 East       Newton                         7
          Linda      Green           6456.00 2002-05-19 00:00:00.000 East       Calgary                        8
          David      Larry           5345.00 2008-03-18 00:00:00.000 West       New York                       9
          James      Cat             4234.00 2007-07-17 00:00:00.000 West       Regina                         9
          Joan       Act             6123.00 2001-04-16 00:00:00.000 North      Toronto                       10

(rows affected)
1>
2>
3>
4SELECT ID,start_Date,
5> DATEDIFF(m, Start_Date, GETDATE()) MonthsFromNow
6FROM Employee
7> GO
ID          start_Date              MonthsFromNow
----------- ----------------------- -------------
          1 2005-03-22 00:00:00.000            31
          2 2003-07-21 00:00:00.000            51
          3 2001-12-01 00:00:00.000            70
          4 2006-03-03 00:00:00.000            19
          5 2004-07-02 00:00:00.000            39
          6 2002-05-19 00:00:00.000            65
          7 2008-03-18 00:00:00.000            -5
          8 2007-07-17 00:00:00.000             3
          9 2001-04-16 00:00:00.000            78

(rows affected)
1>
2>
3> drop table employee;
4> GO
10. 4. DATEDIFF
10. 4. 1. Finding the Difference Between Two Dates
10. 4. 2. DATEDIFF returns the difference between two dates as specified by datepart: DATEDIFF(datepart,date1,date2)
10. 4. 3. select DATEDIFF(day, '2001-12-01', '2002-09-30')
10. 4. 4. select DATEDIFF(month, '2001-12-01', '2002-09-30')
10. 4. 5. select DATEDIFF(year, '2001-12-01', '2002-09-30')
10. 4. 6. select DATEDIFF(hour, '06:46:45', '11:35:00')
10. 4. 7. select DATEDIFF(minute, '06:46:45', '11:35:00')
10. 4. 8. select DATEDIFF(second, '06:46:45', '11:35:00')
10. 4. 9. select DATEDIFF(quarter, '2001-12-01', '2002-09-30')
10. 4. 10. select DATEDIFF(week, '2001-12-01', '2002-09-30')
10. 4. 11. select DATEDIFF(day, '2002-09-30', '2001-12-01')
10. 4. 12. SELECT DATEDIFF(yy, 'Jan 1, 1998', 'Dec 31, 1998')
10. 4. 13. SELECT DATEDIFF(yy, 'Dec 31, 1998', 'Jan 1, 1999')
10. 4. 14. Find difference in months between now and EndDate
10. 4. 15. A SELECT statement that computes the age of a Billing with DATEDIFF
10. 4. 16. Days between two dates
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