MySQL查詢將多行轉換為一行

Question

表格1 表 2 我用來從我的數據庫中獲取第一個表的查詢：

use mydb;
select doc_id,first_name,title,overall_experience_years,address,description_,Price,degree_name from doctor_profile d inner join doctor_education e on d.doc_id=e.doctor_id inner join doc_degree_master m1 on m1.id=e.doc_degree_master_id inner join doctor_specialization s on d.doc_id=s.doctor_id inner join doc_specialization_master m2 on m2.id=s.doc_Specialization_master_id inner join doctor_pricing p on p.doctor_id=d.doc_id;

我想以表 2 的形式獲取數據。 我應該寫什么查詢？

這是我在 springboot 中的模型類：

@Id
private Long Id;
private String Name;
private String Title;
private int OverallExperience;
private BigDecimal Price;
private String Address;
private List<String> Specialities;
private List<String> Degrees;

Answer 1

請參閱聚合函數GROUP_CONCAT(expr) 。

select doc_id
     , first_name
     , title
     , overall_experience_years
     , address
     , group_concat(distinct description_) as description_
     , Price
     , group_concat(distinct degree_name) as degree_name
  from doctor_profile d
  join doctor_education e on d.doc_id = e.doctor_id
  join doc_degree_master m1 on m1.id = e.doc_degree_master_id
  join doctor_specialization s on d.doc_id = s.doctor_id
  join doc_specialization_master m2 on m2.id = s.doc_Specialization_master_id
  join doctor_pricing p on p.doctor_id = d.doc_id
 group by doc_id
        , first_name
        , title
        , overall_experience_years
        , address
        , Price

Answer 2

當要合並 1 個以上的值時，可以使用 group_concat() 函數。 但是當你想合並 uniq 值時，你必須使用 distinct 。

group_concat(distinct tab_name) 並使用 group by other tab_name 除了 (description_ and degree_name)

select doc_id, first_name, title, overall_experience_years, address
, group_concat(distinct description_) as description_ , Price
, group_concat(distinct degree_name) as degree_name
      from doctor_profile d
      join doctor_education e on d.doc_id = e.doctor_id
      join doc_degree_master m1 on m1.id = e.doc_degree_master_id
      join doctor_specialization s on d.doc_id = s.doctor_id
      join doc_specialization_master m2 on m2.id = s.doc_Specialization_master_id
      join doctor_pricing p on p.doctor_id = d.doc_id
     group by doc_id, first_name, title, overall_experience_years, address, Price