從一個表中選擇多個列，從另一個表中獲取相應的詳細信息並將它們插入到另一個表中

Question

主表：包含所有詳細信息，如proper_ID 和proper_Name 等字段。

父表：有母親和父親的唯一 ID，不存在proper_ID 和proper_Name

子表：需要以與父表相同的順序插入proper_ID 和proper_Name 並避免重復條目。

Master_Table
---------------------------------------------------------------
Proper_ID | Proper_Name | Proper_Address | Proper_Phone |Proper_Zipcode
----------------------------------------------------------------
ABC_235 | Pansy Montgomery | 427 Preston Court| 1234| 5679
KWH_631 | Price Maxwell | 164 Conduit Boulevard| 8782| 7893
DEA_124 | Howard Kelly | 314 Agate Court| 3234| 1529
FAE_832 | Best Mcpherson | 325 Dorchester Road| 1582| 1861


Parent_Table
---------------------------------------------------
M_ID | F_ID | Picture_URL | Age_Group | Email
---------------------------------------------------
235| 832 | http://placehold.it/32x32| 45 | espinozastrickland@accruex.com
631| 124 | http://placehold.it/32x32| 50 | roycooke@concility.com

Output Expected:
Child_Table
---------------------------------------------------
Mother_ID | Mother_Name | Father_ID | Father_Name
---------------------------------------------------
ABC_235 | Pansy Montgomery | FAE_832 | Best Mcpherson
KWH_631 | Price Maxwell | DEA_124| Howard Kelly 


select mt.proper_id, mt.proper_name from master_table mt, parent_table pt
where mt.proper_id in (pt.m_id, pt.f_id)

proper_id | proper_name
-------------------------
ABC_235 | Pansy Montgomery
FAE_832 | Best Mcpherson
KWH_631 | Price Maxwell  
DEA_124| Howard Kelly 

Answer 1

您可以使用CREATE ... SELECT語句創建Child_Table 。 您需要將Parent_Table JOIN到Master_Table兩次，一次獲取母親的詳細信息，一次獲取父親的詳細信息。 請注意，您應該使用 ANSI 連接語法，逗號連接已經被取代了很長時間。

CREATE TABLE Child_Table AS
SELECT m1.Proper_ID AS Mother_ID,
       m1.Proper_Name AS Mother_Name,
       m2.Proper_ID AS Father_ID,
       m2.Proper_Name AS Father_Name
FROM Parent_Table p
JOIN Master_Table m1 ON SUBSTRING_INDEX(m1.Proper_ID, '_', -1) = p.M_ID
JOIN Master_Table m2 ON SUBSTRING_INDEX(m2.Proper_ID, '_', -1) = p.F_ID

然后你可以

 SELECT *
 FROM Child_Table

輸出：

Mother_ID   Mother_Name         Father_ID   Father_Name
KWH_631     Price Maxwell       DEA_124     Howard Kelly
ABC_235     Pansy Montgomery    FAE_832     Best Mcpherson

SQLFiddle 上的演示

如果你只想生成一個行對於給定的對M_ID和F_ID值，你可以放置一個UNIQUE的指標Mother_ID, Father_ID在Child_Table在CREATE語句，然后要么IGNORE重復或REPLACE它們：

CREATE TABLE Child_Table (UNIQUE(Mother_ID, Father_ID)) IGNORE
... -- as above

SQLFiddle 上的演示