如何在数据域中将日期，月份，年份与存储的数据库分开

Question

“SELECT * FROM等待EXTRACT（来自dob的年份）AS birthyear，EXTRACT（MONTH FROM dob）AS birthmonth，EXTRACT（DAY FROM dob）AS birthday mem_id ='ADT56639'”

Answer 1

这一项工作

 SELECT
    YEAR(dob) AS birthyear,
    MONTH(dob) AS birthmonth,
    DAY(dob) AS birthday * FROM waiting

Answer 2

SELECT 
      EXTRACT(YEAR from dob) AS birthyear, 
      EXTRACT(MONTH FROM dob) AS birthmonth, 
      EXTRACT(DAY FROM dob) AS birthday 
FROM 
waiting  

Answer 3

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SELECT  EXTRACT(YEAR FROM dob) AS birthyear,
EXTRACT(MONTH FROM dob) AS birthmonth,
EXTRACT(DAY FROM dob) AS birthday, waiting.* FROM 
waiting