Question

嘿这是我的数据库

 users table                               pages table

|user_firstname|                           |page_firstname |
-----------------------------              --------------------------------
|  john    |                               |  matt    | 
|  james   |                               |  quentin | 
|  harry   |                               |  roland  |   
|  oliver  |                               |  thomas  |

这是我对搜索应用程序的查询

SELECT user_id,   
       user_firstname, 
       user_lastname,
       user_profile_picture 
FROM users 
WHERE user_firstname LIKE :user_firstname
OR user_lastname LIKE :user_lastname

适用于用户表。但是我也想从页面列中搜索。例如，当我按下字母M时，它发现了jaMes，但我也想要Matt和thoMas。问题是如果我键入Q它应该只从页面中找到Quentin，如果我键入J它应该只来自用户。如何在此查询中包含pages表？

更新我尝试了此查询

SELECT user_id, 
       user_firstname, 
       user_lastname, 
       user_profile_picture 
FROM users 
WHERE user_firstname LIKE :user_firstname 
OR user_lastname LIKE :user_lastname 
UNION ALL SELECT page_id, 
                 page_firstname,  
                 page_lastname,  
                 page_profile_picture 
FROM pages 
WHERE page_firstname LIKE :page_firstname 
OR page_lastname LIKE :page_lastname

我的结果是这样的：

array (size=4)
  'user_id' => int 5
  'user_firstname' => string 'Roland' (length=3)
  'user_lastname' => string 'lastname' (length=7)
  'user_profile_picture' => string '5_1399841223_536fe1c70ea2b_user_profile.jpg' (length=43)

即使roland在PAGES表中，我得到的结果就像在用户表中一样。我想将它们彼此分开

Answer 1

你可以这样做：

SELECT user_id,
 user_firstname,
 user_lastname,
 user_profile_picture, 'users' as 'type'
FROM users 
WHERE user_firstname LIKE :user_firstname
OR user_lastname LIKE :user_lastname 
UNION ALL SELECT page_id, 
 page_firstname, 
 page_lastname, 
 page_profile_picture ,'pages' as 'type'
FROM pages 
WHERE page_firstname LIKE :page_firstname 
OR page_lastname LIKE :page_lastname

Answer 2

取决于你想要完成的事情 - 如果你想基本上像对待同一张桌子一样对待它们，那么像这样的东西会起作用

SELECT user_id,   
       user_firstname, 
       user_lastname,
       user_profile_picture 
FROM users 
WHERE user_firstname LIKE :user_firstname
OR user_lastname LIKE :user_lastname
UNION ALL
SELECT user_id,   
       user_firstname, 
       user_lastname,
       user_profile_picture 
FROM pages
WHERE user_firstname LIKE :user_firstname
OR user_lastname LIKE :user_lastname

Answer 3

我相信这可能会有效，未经测试。除了http://www.w3schools.com/sql/sql_union.asp中的实验。

SELECT user_id as user_id,   
           user_firstname as firstname, 
           user_lastname as lastname,
           user_profile_picture as profile_picture 
   FROM users 
   WHERE user_firstname LIKE :user_firstname
     OR user_lastname LIKE :user_lastname
   union
   SELECT pages_id as user_id,   
       pages_firstname as firstname, 
       pages_lastname as lastname,
       pages_profile_picture as profile_picture 
    FROM pages 
    WHERE pages_firstname LIKE :user_firstname
    OR pages_lastname LIKE :user_lastname

在两个不同的列中搜索相同的数据

3 个答案: