Question

我在SQL Server中创建存储过程如下：

CREATE PROCEDURE [dbo].[SearchData] 
    @searchText varchar(500)
AS
BEGIN
    SET NOCOUNT ON

    SELECT TOP 50 
        s.[MaxRank] AS [Rank],
        sc.TaskSourceId,
        c.IndividualName,
        c.EntityName,
        c.Text
    FROM
        (SELECT
             MAX(s.Rank) AS MaxRank,
             MAX(c.CaptureId) AS MaxCaptureId,
             c.TaskSourceId
         FROM
             FreeTextTable(Data.SearchData,
                  (Identifier, IndividualName, EntityName, [Text]), @searchText) s
         JOIN
             Data.Capture c ON s.[Key] = c.CaptureId
         GROUP BY
             c.TaskSourceId) s
    JOIN
        Data.Capture c ON c.CaptureId = s.MaxCaptureId
    JOIN
        Data.Source sc ON c.TaskSourceId = sc.TaskSourceId
    ORDER BY
        s.MaxRank DESC
END

以上执行成功，但包含一些结果，其中Text字段是唯一包含数据的字段，其他字段为NULL。我想添加一个条件，在返回的结果中，IndividualName不能为null或EntityName不能为null。

我无法确定将其放在何处以及确切的语法。

Answer 1

我认为你的意思是其中一个字段可以为空。如果是这样的话：

CREATE PROCEDURE [dbo].[SearchData] 
@searchText varchar(500)

AS BEGIN SET NOCOUNT ON

select top 50 s.[MaxRank] as [Rank],
    sc.TaskSourceId,
    c.IndividualName,
    c.EntityName,
    c.Text

from    (
    select  max(s.Rank) as MaxRank,
        max(c.CaptureId) as MaxCaptureId,
        c.TaskSourceId
    from    FreeTextTable(Data.SearchData,
           (Identifier, IndividualName, EntityName, [Text]),
               @searchText) s
    join    Data.Capture c
    on  s.[Key] = c.CaptureId
    group   by c.TaskSourceId
    ) s
join    Data.Capture c
on  c.CaptureId = s.MaxCaptureId
join   Data.Source sc
on     c.TaskSourceId = sc.TaskSourceId
where not (c.IndividualName is null and c.EntityName is null) -- excludes results where both are null
order   by s.MaxRank desc
END

Answer 2

您可以在两列上执行isnull并检查以确保该值不为null，如下所示：

CREATE PROCEDURE [dbo].[SearchData] 
@searchText varchar(500)

AS BEGIN SET NOCOUNT ON

select top 50 s.[MaxRank] as [Rank],
    sc.TaskSourceId,
    c.IndividualName,
    c.EntityName,
    c.Text

from    (
    select  max(s.Rank) as MaxRank,
        max(c.CaptureId) as MaxCaptureId,
        c.TaskSourceId
    from    FreeTextTable(Data.SearchData,
           (Identifier, IndividualName, EntityName, [Text]),
               @searchText) s
    join    Data.Capture c
    on  s.[Key] = c.CaptureId
    group   by c.TaskSourceId
    ) s
join    Data.Capture c
on  c.CaptureId = s.MaxCaptureId
join   Data.Source sc
on     c.TaskSourceId = sc.TaskSourceId
where not isnull(c.IndividualName, c.EntityName) is null  
order   by s.MaxRank desc
END

Answer 3

您也可以在连接条件中使用这些条件。

CREATE PROCEDURE [dbo].[SearchData] 
@searchText varchar(500)

AS BEGIN SET NOCOUNT ON

select top 50 s.[MaxRank] as [Rank],
    sc.TaskSourceId,
    c.IndividualName,
    c.EntityName,
    c.Text
from    (
    select  max(s.Rank) as MaxRank,
        max(c.CaptureId) as MaxCaptureId,
        c.TaskSourceId
    from    FreeTextTable(Data.SearchData,
           (Identifier, IndividualName, EntityName, [Text]),
               @searchText) s
    join    Data.Capture c
    on  s.[Key] = c.CaptureId
    group by c.TaskSourceId
    ) s
join    Data.Capture c
on  c.CaptureId = s.MaxCaptureId AND (c.IndividualName IS NOT NULL OR c.EntityName IS NOT NULL)
join   Data.Source sc
on     c.TaskSourceId = sc.TaskSourceId
order by s.MaxRank desc

END

SQL查询 - 将NOT NULL条件添加到两列中的任何一列

3 个答案: