Select 除了 JOIN MySQL 中的元素

Question

我這里有加入兩個表的代碼。 但是我不想從 Accounts 數據庫中獲取密碼元素。 我怎么能這樣做？

"SELECT f.*, a.* 
   FROM Following as f 
   JOIN Accounts as a on f.followingUserID = a.id 
  WHERE `followingUserID` = '$acID'

Answer 1

“除...之外的所有列”沒有 SQL 約定——要么全部，要么您手動定義列表：

SELECT f.*, 
       a.col1, a.col2,
       a.`col name using spaces not good`
  FROM FOLLOWING as f 
  JOIN ACCOUNTS as a on f.followingUserID = a.id 
 WHERE f.followingUserID = '$acID'

Answer 2

命名列而不是全部檢索它們。

代替。*， ：

a.ColumnName1、a.ColumnName2 等......

Answer 3

如果您不想 select 密碼元素，則需要將a.*更改為 select 每列單獨，即

SELECT f.*, a.account_id, a.name 
FROM following as f 
JOIN accounts as a on f.followingUserId = a.id 
WHERE followingUserID = '$acID'