如何查找以下情况的联接查询

Question

我有两个名为branch和source的表。表格branch包含列b_id和b_name，表格source包含列s_name和b_code，其中每行包含多个b_code被逗号隔开。我想要字段s_name和b_name的结果。

Answer 1

SQL 将是这样的：

SELECT source.s_name, branch.b_id
FROM source
INNER JOIN branch ON source.b_code = branch.b_id
ORDER BY source.b_code

我正在使用 MS SQL ，但尚未对该查询进行测试。如果结果是正确的，请告诉我。

Answer 2

您可以使用FIND_IN_SET尝试以下解决方案：

SELECT s.s_name, GROUP_CONCAT(b.b_name) AS 'b_name'
FROM `source` s INNER JOIN branch b ON FIND_IN_SET(b.b_id, s.b_code)
GROUP BY s.s_name

  

演示： http://sqlfiddle.com/#!9/b7d7d1/4/0

Answer 3

试试这个

SELECT source.*,GROUP_CONCAT(branch.b_name) FROM source LEFT JOIN 
branch ON FIND_IN_SET(branch.b_id,source.b_code) group by source.s_name 

Answer 4

SELECT source.s_name,GROUP_CONCAT(branch.b_name) 
FROM source 
INNER JOIN branch on FIND_IN_SET(branch.b_id,source.b_code) 
GROUP BY source.s_name;

尝试此查询。