Question

我需要创建这样的自定义约束逻辑在一段时间内没有重复的组合

CREATE FUNCTION [dbo].[CheckPriceListDuplicates](
@priceListId uniqueidentifier,
@supplierId uniqueidentifier,
@transportModeId uniqueidentifier,
@currencyId uniqueidentifier,
@departmentTypeId uniqueidentifier,
@consolidationModeId uniqueidentifier,
@importerId uniqueidentifier,
@exporterId uniqueidentifier,
@validFrom datetimeoffset(7),
@validTo datetimeoffset(7))
RETURNS int
AS
BEGIN
DECLARE @result int

IF EXISTS (SELECT * FROM [dbo].[PriceListEntries] AS [Extent1]
        WHERE ([Extent1].[Id] <> @priceListId) AND 
        ((([Extent1].[SupplierAddressBook_Id] IS NULL) AND (@supplierId IS NULL)) OR ([Extent1].[SupplierAddressBook_Id] = @supplierId)) AND 
        ([Extent1].[TransportMode_Id] = @transportModeId) AND 
        ([Extent1].[Currency_Id] = @currencyId) AND 
        ([Extent1].[DepartmentType_Id] = @departmentTypeId) AND 
        ((([Extent1].[ConsolidationMode_Id] IS NULL) AND (@consolidationModeId IS NULL)) OR ([Extent1].[ConsolidationMode_Id] = @consolidationModeId)) AND 
        ((([Extent1].[Importer_Id] IS NULL) AND (@importerId IS NULL)) OR ([Extent1].[Importer_Id] = @importerId)) AND 
        ((([Extent1].[Exporter_Id] IS NULL) AND (@exporterId IS NULL)) OR ([Extent1].[Exporter_Id] = @exporterId)) AND 
        ((@validFrom >= [Extent1].[ValidFrom]) OR (@validTo <= [Extent1].[ValidTo]))
    )
BEGIN
    SET @result = 0
END
ELSE
BEGIN
    SET @result = 1
END
RETURN @result
END

ALTER TABLE [dbo].[PriceListEntries]
ADD CONSTRAINT UniquCombinations CHECK ([dbo].[CheckPriceListDuplicates](
Id,
SupplierAddressBook_Id,
TransportMode_Id,
Currency_Id,
DepartmentType_Id,
ConsolidationMode_Id,
Importer_Id,
Exporter_Id,
ValidFrom,
ValidTo) = 1)

任何想法如何处理out函数？

Answer 1

查询表中多个列并查看它们是否全部（一起）唯一的一种方法是将测试数据连接在一起作为字符串。

Select CONCAT ( Col1, Col2, Col3) AS ConcateString 
from [TABLE_NAME] 
WHERE ConcateString = 'All_of_your_data_in_one_string';

https://msdn.microsoft.com/en-us/library/hh231515.aspx

如果结果产生多个结果，则数据组合不是唯一的。

约束中的SQL自定义逻辑

1 个答案: