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WITH Args1 AS ( SELECT empid, firstname, lastname, birthdate, DATEDIFF(year, birthdate, SYSDATETIME()) AS diff, CAST(SYSDATETIME() AS DATE) AS today FROM HR.Employees ), Args2 AS ( SELECT empid, firstname, lastname, birthdate, today, CAST(DATEADD(year, diff, birthdate) AS DATE) AS bdcur, CAST(DATEADD(year, diff + 1, birthdate) AS DATE) AS bdnxt FROM Args1 ), Args3 AS ( SELECT empid, firstname, lastname, birthdate, today, DATEADD(day, CASE WHEN DAY(birthdate) <> DAY(bdcur) THEN 1 ELSE 0 END, bdcur) AS bdcur, DATEADD(day, CASE WHEN DAY(birthdate) <> DAY(bdnxt) THEN 1 ELSE 0 END, bdnxt) AS bdnxt FROM Args2 )

} } public void setMessage(String message) { this.message = message; } public void setFile(String file) { this.file = file; } }

SELECT empid, firstname, lastname, birthdate, CASE WHEN bdcur >= today THEN bdcur ELSE bdnxt END AS birthday FROM Args3;

The query defining the CTE Args1 calculates for each employee the difference in years between the birth date and today s date (diff ), and it also calculates today s date (today) . If you highlight and run only the query defining the CTE Args1, you get the following output, shown here in abbreviated form, assuming today s date is May 6, 2009:

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empid -----1 2 3 4 5 6 7 8 9 10 11 firstname ---------Sara Don Judy Yael Sven Paul Russell Maria Zoya George Mary lastname ------------Davis Funk Lew Peled Buck Suurs King Cameron Dolgopyatova Schaller North birthdate ----------------------1958-12-08 00:00:00.000 1962-02-19 00:00:00.000 1973-08-30 00:00:00.000 1947-09-19 00:00:00.000 1965-03-04 00:00:00.000 1973-07-02 00:00:00.000 1970-05-29 00:00:00.000 1968-01-09 00:00:00.000 1976-01-27 00:00:00.000 1972-02-29 00:00:00.000 2009-05-06 00:00:00.000 diff ----51 47 36 62 44 36 39 41 33 37 0 today ---------2009-05-06 2009-05-06 2009-05-06 2009-05-06 2009-05-06 2009-05-06 2009-05-06 2009-05-06 2009-05-06 2009-05-06 2009-05-06

Passed attribute values from the build file before calling execute()

To calculate the date of the next birthday for a given employee, you need to add diff years to birthdate . If the result is less than today, you need to add another year . The query defining the CTE Args2 adds to Args1 two attributes called bdcur and bdnxt, which hold the birthday dates this year and next year, respectively . Note, however, that if birthdate falls on February 29, and the target date (bdcur or bdnxt) is not in a leap year, it will contain February 28 and not March 1 . The query defining the CTE Args3 adjusts the dates in bdcur and bdnxt to March 1 if needed . The outer query returns bdcur as the nearest birthday if it is greater than or equal to today s date, and bdnxt otherwise . Here s the output of the solution query, again assuming today s date is May 6, 2009:

empid -----1 2 3 4 5 6 7 8 9 10 11 firstname ---------Sara Don Judy Yael Sven Paul Russell Maria Zoya George Mary lastname ------------Davis Funk Lew Peled Buck Suurs King Cameron Dolgopyatova Schaller North birthdate ----------------------1958-12-08 00:00:00.000 1962-02-19 00:00:00.000 1973-08-30 00:00:00.000 1947-09-19 00:00:00.000 1965-03-04 00:00:00.000 1973-07-02 00:00:00.000 1970-05-29 00:00:00.000 1968-01-09 00:00:00.000 1976-01-27 00:00:00.000 1972-02-29 00:00:00.000 2009-05-06 00:00:00.000 birthday ---------2009-12-08 2010-02-19 2009-08-30 2009-09-19 2010-03-04 2009-07-02 2009-05-29 2010-01-09 2010-01-27 2010-03-01 2009-05-06

You can see that George Schaller s next birthday will occur next year, on March 1 . Mary North s birthday is, not surprisingly, today .

To compile the class defined in listing C.3, you will need to add ant.jar to your lib directory. Then execute the build.task target in the example build file. This will place a JAR containing the new task in Ant s lib directory so it can be found when you invoke it.

A related problem is to calculate the age of a person on a given date . The following query shows one way to achieve this, demonstrating the technique using the Employees table:

The image on the projector screen is on its side (and you re using a Tablet PC).

DECLARE @targetdate AS DATE = CAST(SYSDATETIME() AS DATE); SELECT empid, firstname, lastname, birthdate, DATEDIFF(year, birthdate, @targetdate) - CASE WHEN 100 * MONTH(@targetdate) + DAY(@targetdate) < 100 * MONTH(birthdate) + DAY(birthdate) THEN 1 ELSE 0 END AS age FROM HR.Employees;

The expression first calculates the difference in years between the employee s birth date and the target date . Call that difference diff . If the month plus day part of the target date is smaller than the month plus date part of the employee s birth date, the calculation subtracts one year from diff . Interestingly, this calculation handles leap years correctly . This code generates the following output:

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