从日期使用年龄并创建年龄阶段列

Question

我有使用出生日期显示年龄阶段的问题，这里是我的查询和示例图像

SELECT 
res_fName,res_mName,
res_lName,rs.suffix,
rg.gender_Name,
TIMESTAMPDIFF(YEAR,res_Bday,CURDATE()) AS age,
(SELECT IF (TIMESTAMPDIFF(YEAR,res_Bday,CURDATE()) <=1,'INFANT','')) Age_Stage 
FROM resident_detail rd 
LEFT JOIN ref_suffixname rs ON rd.suffix_ID = rs.suffix_ID 
LEFT JOIN ref_gender rg ON rd.gender_ID = rg.gender_ID

SQL RESULT DISPLAY:

年龄阶段

• 孕产妇和新生儿（ 0至1个月）
• 婴儿（ 1至12个月）
• 幼儿（ 13至24个月）
• 学龄前儿童（ 2至4年）
• 学龄儿童（ 5至8岁）
• Tweens（ 9至12年）
• 少年（ 13至19岁）
• 年轻人（ 20至35岁）
• 中年人（ 36至55岁）
• 高级（ 56至100年）

Answer 1

使用Case语句来确定Age Stage;

   SELECT res_fName,res_mName,res_lName,rs.suffix,rg.gender_Name,TIMESTAMPDIFF(YEAR,res_Bday,CURDATE()) AS age,
(case  
 when (TIMESTAMPDIFF(Month,res_Bday,CURDATE())<=1) then 'Maternal and Newborn'
 when (TIMESTAMPDIFF(Month,res_Bday,CURDATE())<=1 and TIMESTAMPDIFF(Month,res_Bday,CURDATE())<=12) then 'Babies'
when (TIMESTAMPDIFF(Month,res_Bday,CURDATE())<=13 and TIMESTAMPDIFF(Month,res_Bday,CURDATE())<=24) then 'Toddlers'
when (TIMESTAMPDIFF(Year,res_Bday,CURDATE())<=2 and TIMESTAMPDIFF(Year,res_Bday,CURDATE())<=4) then 'Preschoolers'
 when (TIMESTAMPDIFF(Year,res_Bday,CURDATE())<=5 and TIMESTAMPDIFF(Year,res_Bday,CURDATE())<=8) then 'School Age Children'
 when (TIMESTAMPDIFF(Year,res_Bday,CURDATE())<=9 and TIMESTAMPDIFF(Year,res_Bday,CURDATE())<=12) then 'Tweens '
when (TIMESTAMPDIFF(Year,res_Bday,CURDATE())<=13 and TIMESTAMPDIFF(Year,res_Bday,CURDATE())<=19) then 'Teenager'
when (TIMESTAMPDIFF(Year,res_Bday,CURDATE())<=20 and TIMESTAMPDIFF(Year,res_Bday,CURDATE())<=35) then 'Young Adult'
when (TIMESTAMPDIFF(Year,res_Bday,CURDATE())<=36 and TIMESTAMPDIFF(Year,res_Bday,CURDATE())<=55) then 'Middle-Aged Adults'
when (TIMESTAMPDIFF(Year,res_Bday,CURDATE())<=56 and TIMESTAMPDIFF(Year,res_Bday,CURDATE())<=100) then 'Senior'
   end) Age_Stage 
FROM resident_detail rd LEFT JOIN ref_suffixname rs ON rd.suffix_ID = rs.suffix_ID LEFT JOIN ref_gender rg ON rd.gender_ID = rg.gender_ID