如何通過dob訂購，然後訂購姓氏，如果在相同的年齡段，則名字？

Question

到目前爲止，我的查詢看起來是這樣的：

SELECT CONCAT (child_fname,' ',child_sname) AS 'Name', child_dob AS 'DoB', 
FLOOR(DATEDIFF(CURRENT_DATE, child_dob)/365.25) as 'Age' 
FROM Child 
ORDER BY child_dob, child_sname, child_fname; 

我已成功訂購Age，但不知道如何訂購child_sname，然後child_fname當他們是同齡人？

Answer 1

我不知道您的問題..

這個單子月1日按年齡，然後通過SNAME，然後我FNAME

SELECT CONCAT (child_fname,' ',child_sname) AS 'Name', child_dob AS 'DoB', 
FLOOR(DATEDIFF(CURRENT_DATE, child_dob)/365.25) as 'Age' 
FROM Child 
ORDER BY FLOOR(DATEDIFF(CURRENT_DATE, child_dob)/365.25), child_sname, child_fname; 

Answer 2

SELECT CONCAT (child_fname,' ',child_sname) AS 'Name', child_dob AS 'DoB', 
FLOOR(DATEDIFF(CURRENT_DATE, child_dob)/365.25) as 'Age' 
FROM Child 
ORDER BY FLOOR(DATEDIFF(CURRENT_DATE, child_dob)/365.25), child_sname, child_fname; 

Answer 3

您可以排序多個列，你可以按不同的方向排列不同的列asc/desc，如下所示：

SELECT 
    CONCAT (child_fname,' ',child_sname) aS Name, 
    child_dob aS DoB, 
    FLOOR(DATEDIFF(CURRENT_DATE, child_dob)/365.25) as Age 
    FROM Child 
    ORDER BY Age,child_sname, child_fname;