Question

我有一个SQL视图，其返回的结果少于其中的select，我不知道为什么？

SQL视图代码：

SELECT cs.customer_id, cs.store_id, cs.join_date, c.name, c.email, c.phone, cs.points,
       COALESCE (aph.added_point, 0) AS added_point,
       COALESCE (aph.spended_cash, 0) AS spended_cash
FROM dbo.customer_store AS cs 
INNER JOIN dbo.customer AS c
    ON cs.customer_id = c.id 
LEFT OUTER JOIN dbo.added_points_history AS aph
    ON cs.customer_id = aph.customer_id AND cs.store_id = aph.store_id

上面的查询返回26行，但是当我从视图中选择时，它只返回7行！

创建视图的代码：

--Set the options to support indexed views.
SET NUMERIC_ROUNDABORT OFF;
SET ANSI_PADDING, ANSI_WARNINGS, CONCAT_NULL_YIELDS_NULL, ARITHABORT, QUOTED_IDENTIFIER, ANSI_NULLS ON;
GO
--Create view with schemabinding.
IF OBJECT_ID ('dbo.customers_store_with_points', 'view') IS NOT NULL
DROP VIEW dbo.customers_store_with_points ;
GO
CREATE VIEW dbo.customers_store_with_points
WITH SCHEMABINDING
AS
SELECT cs.customer_id, cs.store_id, cs.join_date, c.name, c.email, c.phone, cs.points,
    COALESCE (aph.added_point, 0) AS added_point,
    COALESCE (aph.spended_cash, 0) AS spended_cash
FROM dbo.customer_store AS cs 
INNER JOIN dbo.customer AS c
ON cs.customer_id = c.id 
LEFT OUTER JOIN dbo.added_points_history AS aph
ON cs.customer_id = aph.customer_id AND cs.store_id = aph.store_id
GO
--Create an index on the view.
CREATE UNIQUE CLUSTERED INDEX IDX_customerId_storeId
ON dbo.customers_store_with_points (customer_id, store_id);
GO

从视图中获取结果的选择参数：

SELECT TOP 1000 * 
FROM [dbo].[customers_store_with_points]
order by store_id

Answer 1

具有相同数据源的相同查询会返回相同的结果您要么查询不同的数据库，要么查询不同。

View返回SELECT

1 个答案: