按给定字段对多个 SQL 结果进行分组

Question

如何按员工对以下查询的结果进行分组？

好的，所以我有三个表： 1. company_employee 其中包含映射到公司 ID (company.id) 的员工 ID (company_employee.employee)。它还包含一个员工角色

employee 包含员工名字、姓氏
公司，其中包含一个 ID 和一个名称

现在我正在检索具有特定角色的所有员工，但我得到了具有不同公司映射的同一员工的多个条目。是这样的：我的查询是：

SELECT company_employee.employee, company_employee.company, employee.fname, employee.lname, company.name
 FROM company_employee
 JOIN employee on employee.id = company_employee.employee
 JOIN company on company.id = company_employee.company
 WHERE company_employee.role= 185;

我的结果是：

company_employee.employee     company_employee.company     employee.fname     employee.lname    company.name
111                           100                          John               Smith             Super Candy
111                           101                          John               Smith             Red Ballons
222                           102                          Kevin              Lora              Super Computers
111                           103                          John               Smith             Star Events
222                           104                          Kevin              Lora              Vintage Pencils
333                           105                          Margarett          Bush              Top Security

我要的是这样的房源：

Employee 111 John Smith mapped to a list of companies (100, 101, 103)
Employee 222 Kevin Lora mapped to a list of companies (102, 104)
Employee 333 Margarett Bush mapped to a list of companies (105)

这可能吗？

Answer 1

您似乎在寻找 listagg 函数：

SELECT   company_employee.employee, employee.fname, employee.lname, 
         LISTAGG(company_employee.company) 
           WITHIN GROUP (ORDER BY company_employee.company),
         LISTAGG(company.name) 
           WITHIN GROUP (ORDER BY company_employee.company),
FROM     company_employee
JOIN     employee ON employee.id = company_employee.employee
JOIN     company ON company.id = company_employee.company
WHERE    company_employee.role = 185
GROUP BY company_employee.employee, employee.fname, employee.lname

按给定字段对多个 SQL 结果进行分组

Grouping multile SQL results by a given field

sql

database

oracle

database-schema