Question

我正在尝试在MS SQL中创建一个具有两个表和单个字段的连接的视图。我已经完成了连接部分，但现在我想在此视图中添加一个新字段，该字段不在任何已连接的表中。所以任何人都知道如何在视图中创建这个新领域。

Answer 1

如果需要，您可以显式命名每个字段，并根据需要使用AS对其进行别名。例如：

SELECT si.field1 as si_field1,
       si.field2 as si_field2,
       ind_data.field1 as ind_data_field1
  FROM sites_indexed as si
  LEFT JOIN individual_data as ind_data 
         ON si.id = ind_data.site_id

然后您可以在结果集中引用别名。

Answer 2

如果您想要ACTIVE字段中所有行的默认值，请尝试使用

CREATE VIEW Slots AS 
SELECT Event.EventId, 
Event.eventName, 
examCenter.centerId, 
examCenter.centerName, 
slotTime.slotTimeId, 
slotTime.FromTime, 
slotTime.ToTime, 
slotTime.Dated, 
examCenter.noOfSeats,
CAST(1 AS bit) AS Active 
FROM examCenter 
INNER JOIN Event 
ON examCenter.eventId = Event.EventId 
INNER JOIN slotTime ON Event.EventId = slotTime.eventId

如果ACTIVE字段的值取决于某些条件，请说

slottime.Dated => getdate()

然后，你需要替换

CAST(1 AS bit) AS Active

在上面的代码中，带

CAST(CASE WHEN slottime.Dated => getdate() THEN 1 ELSE 0 AS bit) AS ACTIVE

如何在视图中添加单个字段

2 个答案: