mysql輸出到同一個表中使用主鍵與子選擇的值

Question

例如，我如何引用子名稱。當所有我已經是母親的名字使用子查詢

id-Name - mother 
1 -son - 2 
2 -mommy - null 

Answer 1

這是使用子查詢。

SELECT t.*, 
     (SELECT Name FROM TABLE_NAME WHERE mother = t.id) as sons_name 
FROM TABLE_NAME as t 
WHERE t.name = 'Mommy' 

但你可以把它用也加入做：

SELECT t1.*, t2.name as sons_name 
FROM TABLE_NAME as t1 
     LEFT JOIN TABLE_NAME as t2 ON t2.mother = t1.id 
WHERE t1.name = 'Mommy'