MYSQL - 選擇查詢Where條件是指同一臺

Question

我有一個表，看起來像：

TBLA

code | name | parent_code | status | child 
--------------------------------------------------------- 
1  | ABC  |     | complete | N 
1.1  | ABC.1  | 1    | pending | Y 
2  | BCD  |     | pending | N 
2.1  | BCD.1  | 2    | pending | Y 

我試圖讓與child = Y的記錄，它的父status = complete

這是我想要獲得的輸出

code | name | parent_code | status | child 
---------------------------------------------------------- 
1.1  | ABC.1  | 1    | pending | Y 

到目前爲止，我正在使用的方法是查詢帶有child=Y的所有記錄，並再次循環以獲取來自先前查詢的每個code基於parent_code的狀態。

是否可以使查詢更簡單？

Answer 1

檢查這一項。

SELECT C.* 
    FROM tblA C 
    INNER JOIN tblA P ON P.code = C.parent_code 
    WHERE C.child = 'Y' 
     AND P.status = 'complete' 

Answer 2

自加入應該做的工作：

SELECT child.* 
from tblA child join tblA parent on child.parent_code =parent.code 
WHERE parent.child = 'N' and parent.status = 'complete' 

Answer 3

SELECT code, name , parent_code,status, child 
from tblA 
WHERE child = 'Y' and status = 'PENDING' 

pl. try i am not sure about your resultset