Question

我正在为此SQL查询使用第三方软件，该查询具有各种限制，一个是1,000个字符的字符限制。我创建的代码将通过注册到特定帐户的联系人号码列表，并具有专门为此任务创建的视图。我当前的脚本（见下文）有效，但会带来重复的响应。我想缩短代码的长度，并仅选择Distinct响应。

作为背景，这个链接到的CRM系统有多个地方，有人可以留下联系号码，所以我需要代码在显示响应时删除任何重复项。由于上述字符限制，当前代码不会尝试删除重复项，它是：

SELECT [Contact_Mobile_Phone] AS V, [Contact_Mobile_Phone] AS D
FROM [DatabaseName]
WHERE MAINLKUPID = '{Import.TenantID}' AND [Contact_Mobile_Phone] IS NOT NULL
UNION ALL
SELECT [Contact_Home_Phone] AS V, [Contact_Home_Phone] AS D
FROM [DatabaseName]
WHERE MAINLKUPID = '{Import.TenantID}' AND [Contact_Home_Phone] IS NOT NULL
UNION ALL
SELECT [Contact_Work_Phone] AS V, [Contact_Work_Phone] AS D
FROM [DatabaseName]
WHERE MAINLKUPID = '{Import.TenantID}' AND [Contact_Work_Phone] IS NOT NULL
UNION ALL
SELECT [Group_Home_Phone] AS V, [Group_Home_Phone] AS D
FROM [DatabaseName]
WHERE MAINLKUPID = '{Import.TenantID}' AND [Group_Home_Phone] IS NOT NULL
UNION ALL
SELECT [Group_Mobile_Phone] AS V, [Group_Mobile_Phone] AS D
FROM [DatabaseName]
WHERE MAINLKUPID = '{Import.TenantID}' AND [Group_Mobile_Phone] IS NOT NULL
UNION ALL
SELECT [Contact_Home_Phone] AS V, [Contact_Home_Phone] AS D
FROM [DatabaseName]
WHERE [Group_ID] = '{Script.V1}' AND [Contact_Home_Phone] IS NOT NULL
UNION ALL
SELECT [Contact_Mobile_Phone] AS V, [Contact_Mobile_Phone] AS D
FROM [DatabaseName]
WHERE [Group_ID] = '{Script.V1}' AND [Contact_Mobile_Phone] IS NOT NULL
UNION ALL
SELECT 'Enter other number' AS V, 'Enter other number' AS D

正如您所看到的，它不是我编码的最优雅的东西。我希望它看起来像是这样的：

SELECT DISTINCT ([Contact_Mobile_Phone], [Contact_Home_Phone], [Contact_Work_Phone], [Group_Home_Phone], [Group_Mobile_Phone]) V,
([Contact_Mobile_Phone], [Contact_Home_Phone], [Contact_Work_Phone], [Group_Home_Phone], [Group_Mobile_Phone]) D
FROM [DatabaseName]
WHERE MAINLKUPID = '{Import.TenantID}' AND ([Contact_Mobile_Phone], [Contact_Home_Phone], [Contact_Work_Phone], [Group_Home_Phone], [Group_Mobile_Phone])  IS NOT NULL
AND MAINLKUPID = '{Import.TenantID}' AND ([Contact_Mobile_Phone], [Contact_Home_Phone], [Contact_Work_Phone], [Group_Home_Phone], [Group_Mobile_Phone])  IS NOT NULL

标准是它需要在第V列和第D列中显示相同的结果。它不需要通过Null数据，并且它只需要在每列中输入一次，即使它们来自不同的列本来。我知道我的理想代码的语法是对的，希望有人可以指出我正确的方向。提前谢谢。

Answer 1

为什么不将代码放在存储过程中并只调用“EXEC my_stored_procedure;”？那会短得多！

Answer 2

你能解释为什么两次选择同一列，但给它命名不同吗？也许你打算第一个作为描述。如果是这样，它应该是单引号而不是方括号 - 但这会影响重复消除。

您可以执行以下操作以删除重复项：

将UNION ALL替换为UNION

您可以执行以下操作来缩小尺寸：

删除所有方括号
从除第一个查询之外的所有内容中删除as V和as D

如果这还不够短，则删除NULL比较并将查询结构为：

select *
from (<your query here with no null comparisons and `union` instead of `union all`) x
where d is not null;

Answer 3

select  phone_num as V,phone_num as D
from    [DatabaseName] unpivot (phone_num for phone_type in ([Contact_Mobile_Phone],[Contact_Home_Phone],[Contact_Work_Phone],[Group_Home_Phone],[Group_Mobile_Phone])) u
where   MAINLKUPID = '{Import.TenantID}'
union
select  phone_num as V,phone_num as D
from    [DatabaseName] unpivot (phone_num for phone_type in ([Contact_Home_Phone],[Contact_Mobile_Phone])) u
WHERE   [Group_ID] = '{Script.V1}'
union all
SELECT 'Enter other number','Enter other number'

减少我的SQL代码的长度

3 个答案: