加入2个字段的表格

Question

我有2个表，我需要从2个字段中收集信息

Table A
- ID
- WorkerResponsible
- WorkerTaker

Table B
- Id
- Name
- PersonnelNumber

我想显示PersonnelNumber（MV）而不是ID，但我也不确定如何加入因为2字段，我尝试了以下选择代码，但我不确定是否必须加入2次。

如何为这两个字段收集正确的信息？

SELECT
TableA.WorkerResponsible AS WorkerResponsible,
TableA.WorkerTaker AS WorkerTaker,
TableB.PersonnelNumber AS WorkerSalesResponsibleCode,
TableB.PersonnelNumber AS WorkerSalesTakerCode

FROM TableA
JOIN TableB ON TableB.Id = TableA.WorkerSalesResponsible AND TableB.Id = TableA.WorkerSalesTaker

Answer 1

你应该使用别名（这样）加入tableB两次

SELECT
TableA.WorkerResponsible AS WorkerResponsible,
TableA.WorkerTaker AS WorkerTaker,
tb1.PersonnelNumber AS WorkerSalesResponsibleCode,
tb2.PersonnelNumber AS WorkerSalesTakerCode

FROM TableA
INNER JOIN TableB as tb1 ON tb1.Id = TableA.WorkerSalesResponsible 
INNER JOIN TableB as tb2 ON tb2.Id = TableA.WorkerSalesTaker