Php 从多个关系表查询数据
我试图在一个查询中查询多个关系表中的数据。我有一个收据表,通过将用户id和客户id存储为FK来保存客户购买的信息。我想在获取用户名和客户名的同时查询整个收据列表。这可以/应该在单个查询中完成吗Php 从多个关系表查询数据,php,mysql,codeigniter,mysqli,Php,Mysql,Codeigniter,Mysqli,我试图在一个查询中查询多个关系表中的数据。我有一个收据表,通过将用户id和客户id存储为FK来保存客户购买的信息。我想在获取用户名和客户名的同时查询整个收据列表。这可以/应该在单个查询中完成吗 Receipt Table *--------------------------------------------------* |receipt_id | user_id | customer_id | receipt_info | | 1 | 1 | 1
Receipt Table
*--------------------------------------------------*
|receipt_id | user_id | customer_id | receipt_info |
| 1 | 1 | 1 | 'Some text' |
| 2 | 2 | 1 | 'Some text' |
| 3 | 2 | 1 | 'Some text' |
| 4 | 3 | 2 | 'Some text' |
| 5 | 3 | 3 | 'Some text' |
*--------------------------------------------------*
User Table
*-----------------------*
|user_id | user_name |
| 1 | Michael |
| 2 | Dwight |
| 3 | Jim |
| 4 | Andy |
| 5 | Stanley |
*-----------------------*
Customer Table
*---------------------------*
|customer_id| customer_name |
| 1 | Schofield |
| 2 | Julia |
| 3 | Dunmore High|
| 4 | Deckert |
| 5 | Prince Paper|
*---------------------------*
所以我希望我的结果集是这样的:
Results Table
*------------------------------------------------------*
|receipt_id | user_name | customer_name | receipt_info |
| 1 | Michael | Schofield | 'Some text' |
| 2 | Dwight | Schofield | 'Some text' |
| 3 | Dwight | Schofield | 'Some text' |
| 4 | Jim | Julia | 'Some text' |
| 5 | Jim | Dunmore High | 'Some text' |
*------------------------------------------------------*
您可以做的是:
SELECT receipt_id,user_name,customer_name, receipt_info
FROM user u
INNER JOIN receipt r
on r.user_id = u.user_id
INNER JOIN customer c
on c.customer_id = r.customer_id
我想这就是你想要的….你能做的是:
SELECT receipt_id,user_name,customer_name, receipt_info
FROM user u
INNER JOIN receipt r
on r.user_id = u.user_id
INNER JOIN customer c
on c.customer_id = r.customer_id
我想这就是你想要的……你应该使用连接。有关更多信息,请检查此链接您应该使用连接。有关更多信息,请查看此链接