Multiple NULLs In A Table

Apr 5, 2004

To make the long story short, we have a situation where there can be different datatypes for a column. For example, 'AttributeValue' can be a datetime, int, float etc. My DBA is suggesting the following design,

tblAttribute

AttributeId, AttributeDataTypeId, AttributeValueInt, AttributeValueFloat, AttributeValueDateTime etc

For any AttributeId, only one of the value columns will have a value and the rest will be NULLs. I feel that this is a bad design. (FYI, We decided against SQLVariant for specific reasons). I have suggested, we create a seperate table for each datatype, like

tblAttribute: AttributeId, AttributeDataTypeId

tblAttributeValueFloat: AttributeId INT, AttributeValue FLOAT
tblAttibuteValueDateTime: AttributeId INT, AttributeValue DATETIME
etc for each datatype.

Depending on the AttributeDataTypeId in the Attribute table go to the specific table and pick up the value. This way, we don't need to have too many NULLs in a row. Which of the 2 do you think is a better design? And if you agree with me, what would be the points to support it.

Your time is greatly appreciated

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Multiple Data Types In One Table With Nulls

Sep 25, 2013

Our database stores vehicle data in one table, but 3 different types of data are stored in the one table. The table contains all the columns for all 3 types so when you query the table you get at least 3 rows back with null values for all the columns that don't apply to that record. The data is imported to the table when it's updates so there's a possibility that they're updated at different times so they have a different BATCH like:

BATCH TYPE ID RATING INSURANCE SAFETY
300 SAFE 123 NULL NULL A
300 INS 123 NULL YES NULL
250 RATE 123 A NULL NULL

What I'd like returned is:
ID, RATING, INSURANCE, SAFETY
123 A YES A

I'm trying to do a case statement to pull the data down, but I keep ending up with multiple rows because of all the nulls. I tried doing a SUM of the case statement with an ISNULL(SAFETY,0) but I can't SUM char values. I can probably do this with 3 temp tables to load the data that I want for each TYPE into them and then select and join them together, but is there a better way to do this?

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Hi,

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Ilya

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----------------------------------

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...

The unpivoted result looks like

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-------------------

ID1 D1 T1

ID1 D2 T2

€¦



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I know a case statement isn't necessary here, but this section is only one small part of a larger script, so I just used it to be consistent, and it will be easier to make any future changes this way. Below is my code and the error message I'm getting...


select
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ixo_title as Title,
ixo_rlt_code as OldRole,
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or ixo_title = ''
or ixo_title = ' '
or ixo_title = ' ' THEN 'Other'

END as NewRole


from
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where
cst_delete_flag = 0
and cst_type = 'Individual'
and ixo_rlt_code is null


This is the Error Message I get:
Server: Msg 515, Level 16, State 2, Line 1095
Cannot insert the value NULL into column 'NewRole', table 'tempdb.dbo.#temp_______________________________________________________________________________________________________________00000001698C'; column does not allow nulls. INSERT fails.
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AS

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PlanName2
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END
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BEGIN
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END

SET @Status = 'Adding plan information to Plan table.'
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Description
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CPlanId,
@UserId,
PlanName1,
PlanName2
FROM
Census
WHERE
PlanId NOT IN (
SELECT DISTINCT
CPlanId
FROM
Statements..Plan
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END
ELSE
BEGIN
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END

SET NOCOUNT OFF
 
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Regards
Karen

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