I have this fact table:
CREATE TABLE [dbo].[FACT_TABLE]
(
[A_id] [int] NOT NULL,
[B_id] [int] NOT NULL,
[C_id] [int] NOT NULL,
[D_id] [int] NOT NULL,
[FACT_total] [float] NOT NULL,
[FACT_average] [float] NOT NULL,
CONSTRAINT [PK_FACT_TABLE]
PRIMARY KEY CLUSTERED ([A_id] ASC, [B_id] ASC,
[C_id] ASC, [D_id] ASC)
) ON [PRIMARY]
I have a T-SQL Script to load data into my fact table:
INSERT INTO [dbo].[FACT_TABLE] ([A_id], [B_id], [C_id], [company_id], [D_id],[FACT_total], [FACT_average])
SELECT
b.A_id, c.B_id, d.C_id, e.D_id,
AVG(FACT_total) AS FACT_total,
AVG(FACT_average) AS FACT_average
FROM
[dbo].[staging_Area] a
INNER JOIN
[dbo].[DIM_A] b ON a.A_id = b.A_id
INNER JOIN
[dbo].[DIM_B] c ON a.[B_id] = c.B_id
INNER JOIN
[dbo].[DIM_C] d ON a.[C_id] = d.C_id
INNER JOIN
[dbo].[DIM_D] e ON a.D_id = e.D_id
GROUP BY
b.A_id, c.B_id, d.C_id, e.D_id
How can I guarantee that I don't insert duplicate values in my fact table in order to not get referential integrity error?
I tried with the following statement after that query:
EXCEPT
SELECT *
FROM [dbo].[FACT_TABLE]
But I think that isn't the best approach for this...
Anyone have another alternative for this? Sorry but I can't put the real column and tables names...
Thanks!