解析
select c.Name as Customers from Customers as c left join Orders as o
on c.id = o.CustomerId
where o.CustomerId is null;通过select 查询 Name 并 as Customers
左外连接查询
当 CustomerId为 null；
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解析
select c.Name as Customers from Customers as c left join Orders as o
on c.id = o.CustomerId
where o.CustomerId is null;通过select 查询 Name 并 as Customers
左外连接查询
当 CustomerId为 null；
相关文章：