非等值連接的兩個表

Question

我有2個表，我需要加入這個2個表，但我沒有這兩個表中公共列。表結構如下

CREATE TABLE customer(
     cust_id NUMBER 
               CONSTRAINT cus_id_pk PRIMARY KEY, 
     cust_name VARCHAR2(20) NOT NULL, 
     address VARCHAR2(40), 
     contact_no NUMBER NOT NULL, 
     email_id VARCHAR2(30)); 

CREATE TABLE supplier(
     supp_id NUMBER 
               CONSTRAINT supp_id_pk PRIMARY KEY, 
     supp_name VARCHAR2(20) NOT NULL, 
     address VARCHAR2(40), 
     contact_no NUMBER NOT NULL, 
     email_id VARCHAR2(30)); 

問題： 創建一個SQL查詢來列出所有以contact_no開頭和結尾爲9的客戶和供應商。

Answer 1

正常UNION應該這樣做;

SELECT 'customer' type, cust_id id, cust_name name, address, contact_no, email_id 
FROM customer WHERE contact_no LIKE '9%9' 
UNION 
SELECT 'supplier' type, supp_id id, supp_name name, address, contact_no, email_id 
FROM supplier WHERE contact_no LIKE '9%9' 

編輯：如果你真的想JOIN與弱的標準，你可以很容易做到這一點;

SELECT c.cust_id, c.cust_name, c.address cust_addr, 
    c.contact_no cust_contact_no, c.email_id cust_email_id, 
    s.supp_id, s.supp_name, s.address supp_addr, 
    s.contact_no supp_contact_no, s.email_id supp_email_id 
FROM customer c 
JOIN supplier s 
    ON c.contact_no LIKE '9%9' 
AND s.contact_no LIKE '9%9'; 

An SQLfiddle showing both。

Answer 2

你可以做這樣的事情： -

(SELECT * 
    FROM customer 
    WHERE contact_no LIKE '9%9') 

    UNION ALL 

    (SELECT * 
    FROM supplier 
    WHERE contact_no LIKE '9%9')