Question

我们正在尝试构建一个以扁平化方式提供数据的视图，以支持简单搜索。

我们面临的挑战是，当我们显示名称等字段时，我们需要搜索我们尚未显示的地址等字段，但仍可以返回。地址存储在地址表中，每个客户记录可以有多个地址。

所以我最初想过做一个将主客户端记录与各种地址放在一起的视图。由于连接，这导致重复的行。

接下来，我编写了一个查询，汇总这些子表并将它们连接在一起。这样可以轻松搜索并且不会产生任何重复。我把它放在一个视图中，但它很慢。由于访问数据的组件的性质，我更喜欢保持视图，但是，我并不完全反对它。

这可以加快速度，还是以错误的方式解决这个问题？

这是SQL（实际上是T-SQL）：

WITH ClientBase
AS
(
    SELECT DISTINCT Client.ClientID, ClientNames.FirstName, ClientNames.LastName, ClientNames.MiddleName, 
        AddressHistory.Address1 + ' ' + AddressHistory.Address2 AS StreetAddress, 
        AddressHistory.City, ContactInfo.Contact AS Phone
    FROM Client
        INNER JOIN ClientNames ON ClientNames.ClientID = Client.ClientID
        INNER JOIN AddressHistory ON AddressHistory.ClientID = Client.ClientID
        INNER JOIN ContactInfo ON ContactInfo.ClientID = Client.ClientID
)
SELECT DISTINCT vcs.ClientID, vcs.FirstName, vcs.LastName, vcs.MiddleName,
                (SELECT STUFF ((SELECT DISTINCT TOP (100) PERCENT ';' + ClientBase.StreetAddress AS [text()]
                                FROM ClientBase
                                WHERE ClientBase.ClientID = vcs.ClientID
                                FOR XML PATH('')), 1, 1, '') AS StreetAddress) AS StreetAddress,
                (SELECT STUFF ((SELECT DISTINCT TOP (100) PERCENT ';' + ClientBase.City AS [text()]
                                FROM ClientBase
                                WHERE ClientBase.ClientID = vcs.ClientID
                                FOR XML PATH('')), 1, 1, '') AS City) AS City,
                (SELECT STUFF ((SELECT DISTINCT TOP (100) PERCENT ';' + ClientBase.Phone AS [text()]
                                FROM ClientBase
                                WHERE ClientBase.ClientID = vcs.ClientID
                                FOR XML PATH('')), 1, 1, '') AS Phone) AS Phone
FROM ClientBase AS vcs

Answer 1

创建索引视图并尝试避免不必要的distinct子句。 Create Indexed Views

用于搜索的SQL视图很慢

1 个答案: