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Editorial Team
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Asked: 2026-05-24T10:15:13+00:00

I have this on my WHERE clause dob <= DATE_SUB(CURDATE(),INTERVAL 1 YEAR) AND dob

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I have this on my WHERE clause

dob <= DATE_SUB(CURDATE(),INTERVAL 1 YEAR) AND dob >= DATE_SUB(CURDATE(),INTERVAL 19 YEAR)

It works alright,it searches a persons by age based on their DOB,
however there is some precision issues.

Consider the following: 

1 to 19                                 =             397
20-25                                   =            1350
26- 30                                  =            1139
31-35                                   =             601
36-40                                   =             346
41-45                                   =             218
46- 50                                  =             154
51-55                                   =             139
56-60                                   =              65
61-85                                   =              78      Total = 4487

If I use the same method but search for 1 – 85 return 5607

I am puzzled but then again dates are my weakness so any help would be appreciated.

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1 Answer

  1. Editorial Team

    Oh, I think when you do DATE_SUB(CURDATE(),INTERVAL 19 YEAR) and then DATE_SUB(CURDATE(),INTERVAL 20 YEAR)

    You miss people in there 19th years, so you’re missing the people in there 19th, 26th, 30th, 35th … etc

    It should be
    dob < DATE_SUB(CURDATE(),INTERVAL 1 YEAR) AND dob >= DATE_SUB(CURDATE(),INTERVAL 19 YEAR)

    And then
    dob < DATE_SUB(CURDATE(),INTERVAL 19 YEAR) AND dob >= DATE_SUB(CURDATE(),INTERVAL 25 YEAR)

    edit : 

     1  to 19                                   =            ??
 19 to 25                                   =            ??
 25 to 30                                   =            ??
 30 to 35                                   =            ??
 35 to 40                                   =            ??
 40 to 45                                   =            ??
 45 to 50                                   =            ??
 50 to 55                                   =            ?? 
 55 to 60                                   =            ??
 60 to 85                                   =            ??`
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