How to Calculate Age from Date of Birth in SQL?

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This post will teach you how to calculate age from date of birth in SQL, allowing you to complete this task quickly and accurately. Structured Query Language, or SQL, is a powerful tool for managing and analyzing large amounts of data. Determining a person’s age using their birthdate is a common requirement in data analysis. This computation is used in a variety of fields, including customer relationship management, human resources, and healthcare analytics. 

Understanding Date and Time Functions in SQL

Comprehending how SQL handles dates and times before calculating age is crucial. Several built-in SQL functions are intended to work with date and time data. These functions can compute differences between dates, extract particular portions of dates, and much more. There are differences in the precise syntax and functions available amongst various SQL implementations, including MySQL, SQL Server, PostgreSQL, and Oracle. The fundamental ideas are still the same on all of these platforms, though.

Step-by-Step Guide to Calculate Age from Date of Birth in SQL

  • Extracting the Year from Dates: First, determine the year by taking the current date and the birthdate. The YEAR() function can be used to accomplish this.
  • Initial Age Calculation: The birth year is then subtracted from the current year to determine the initial age.
  • Adjusting for Birthdays: We must compare the current month and day with the birth month and day to determine whether the person has celebrated their birthday this year.
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SELECT 

  YEAR(CURRENT_DATE) – YEAR(DateOfBirth) – 

  (CASE 

     WHEN MONTH(CURRENT_DATE) < MONTH(DateOfBirth) OR 

          (MONTH(CURRENT_DATE) = MONTH(DateOfBirth) AND DAY(CURRENT_DATE) < DAY(DateOfBirth)) 

     THEN 1 

     ELSE 0 

   END) AS AdjustedAge

FROM YourTable;

Dealing with Leap Years and Other Anomalies

Leap years and other anomalies related to dates can make determining an individual’s age even more complex. A person born on February 29th, for instance, will not celebrate their birthday each year. These edge cases are handled by SQL’s date functions, guaranteeing precise age computations.

Accounting for Leap Year Birthdays

SELECT 

  CASE 

    WHEN MONTH(DateOfBirth) = 2 AND DAY(DateOfBirth) = 29 THEN 

      CASE 

        WHEN MONTH(CURRENT_DATE) = 2 AND DAY(CURRENT_DATE) = 28 THEN 1 

        WHEN MONTH(CURRENT_DATE) > 2 THEN 1 

        ELSE 0 

      END 

    ELSE 

      (CASE 

         WHEN MONTH(CURRENT_DATE) < MONTH(DateOfBirth) OR 

              (MONTH(CURRENT_DATE) = MONTH(DateOfBirth) AND DAY(CURRENT_DATE) < DAY(DateOfBirth)) 

         THEN 1 

         ELSE 0 

       END) 

  END AS LeapYearAdjustment

FROM YourTable;

Putting It All Together: A Comprehensive SQL Age Calculation

SELECT 

  YEAR(CURRENT_DATE) – YEAR(DateOfBirth) – 

  (CASE 

     WHEN MONTH(DateOfBirth) = 2 AND DAY(DateOfBirth) = 29 THEN 

       CASE 

         WHEN MONTH(CURRENT_DATE) = 2 AND DAY(CURRENT_DATE) = 28 THEN 1 

         WHEN MONTH(CURRENT_DATE) > 2 THEN 1 

         ELSE 0 

       END 

     ELSE 

       (CASE 

          WHEN MONTH(CURRENT_DATE) < MONTH(DateOfBirth) OR 

               (MONTH(CURRENT_DATE) = MONTH(DateOfBirth) AND DAY(CURRENT_DATE) < DAY(DateOfBirth)) 

          THEN 1 

          ELSE 0 

        END) 

   END) AS AccurateAge

FROM YourTable;

Conclusion

SQL’s date and time functions provide a reliable solution for Calculate Age from Date of Birth in SQL, which is essential in many data-driven fields. Accurate age computations can be achieved by leveraging these functions and taking into account edge cases such as leap years, thereby improving data analytics precision across multiple SQL platforms.

FAQ of Calculate Age from Date of Birth in SQL

Q1. How can I determine my age based on my birthdate?

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Ans. The process of determining an individual’s age entails comparing their birthdate with the date that the age must be determined. The age of the individual is obtained by deducting the date of birth from the specified date. i.e., Date of birth – Given date equals age.

Q2. In SQL, how do I choose a birth year based on a birth date?

Ans. To extract the year portion from a date, use SQL Server’s YEAR() function. The only input required by this function is a date in one of the date and time or date data types. (The date data type in the column Birth Date in our example). An expression or the name of a column can be an argument.

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