[英]get data from two tables using sql inner join, Trying to get property of non-object
[英]SQL: How to get relational data from two tables? (Using JOIN ?)
到目前為止,我一直在嘗試做一些交叉關系SQL查詢,但沒有成功。 想知道是否有人可以提供幫助?
我有兩個感興趣的表,正在嘗試找出我的哪些客戶(=公司聯系人1)必須處理未完成的項目。 這是表格結構:
TABLE: CUSTOMERS
ID | CUSTOMER_NAME | COMPANY_CONTACT
=================================================
1 Bob 1
2 Billy 2
3 Susan 2
4 Ryan 3
5 Sally 1
。
TABLE: TO_DOS
ID | TASK | CUSTOMER_ID
============================================
1 Make Tea 5
2 Pick flowers 1
3 Do invoices 3
4 Tidy up 4
5 Drive van 2
理想的輸出是
CUSTOMER_ID | CUSTOMER_NAME | TASK
=================================================================
5 Sally Make Tea
1 Bob Pick flowers
到目前為止,我已經嘗試過了,但是並沒有解決任何問題:
SELECT * FROM TO_DOS
INNER JOIN CUSTOMERS
WHERE CUSTOMERS.COMPANY_CONTACT=1
任何想法,不勝感激!
SELECT CUSTOMERS.ID, CUSTOMERS.CUSTOMER_NAME, TO-DOS.TASK
FROM TO_DOS
INNER JOIN CUSTOMERS
ON TO_DOS.CUSTOMER_ID = CUSTOMERS.ID
WHERE CUSTOMERS.COMPANY_CONTACT = 1
SELECT * FROM TO_DOS AS A
INNER JOIN CUSTOMERS AS B ON A.CUSTOMER_ID=B.ID
WHERE CUSTOMERS.COMPANY_CONTACT=1
公司聯系電話將確定選擇哪個客戶,因此,如果您想選擇Sally和Bob,則將選擇1。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.