如何交叉引用具有名字+姓氏字段的两个表

Question

我想匹配两个都有名字和姓氏字段的表。 我想返回与每个人的名字和姓氏组合匹配的记录。

表1字段：

id|firstname|lastname|position|

表2字段：

firstname|lastname|datehired|department|deptcode|

Answer 1

您可以加入多个列：

SELECT t1.id, t1.firstname, t1.lastname, t1.position, 
       t2.datehired, t2.department, t2.deptcode
FROM Table1 t1 INNER JOIN Table2 t2
    ON t1.firstname = t2.firstname
   AND t1.lastname  = t2.lastname

Answer 2

怎么样：

Select FirstName, LastName From Table1

Intersect

Select Firstname, LastName From Table2

Answer 3

您需要在加入时同时包含两个条件

SELECT *  
FROM Table1  
JOIN Table2 ON Table1.firstname = Table2.firstname AND Table1.lastname = Table2.lastname