How Can I Set Constraints According To A Colum Value In Table

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Item_ID Branch Item_type
1 20 A
1 20 B

if item_type =A then data of ITEM_ID from table1
if item_type =B then data of ITEM_ID from table2

How can i set reference constraints in item_id accoding item_type value

Posted 16-Jan-15 19:17pm

Mahesh K.M

Updated 22-Jan-15 16:43pm

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Jörgen Andersson 17-Jan-15 16:41pm

Is table1 and table2 having the same columns?

Mahesh K.M 22-Jan-15 22:42pm

yes,table 1 and table2 has the same column with same datatype and length

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deepakdynamite · Answer 1 · 2015-01-22T17:17:00

Create a scalar function which takes an argument and return single value.
Now while defining table schema use computed column.

For eg:

SQL

Create Table TableName
(
Branch yourdataType,
ItemType yourdataType
Item_ID as (dbo.YourfunctionName(ItemType ))

)

Then dont pass anything in Insert statement for Item_ID... SQL qill processs it automatically...

Jörgen Andersson · Answer 2 · 2015-01-22T20:24:00

Your data model is flawed.
Put it all in one table instead and add a column for the Item_type.
Now you can simply join the tables on Item_type.

The wiki article on normalization is here[^].

But a better article on the why is here[^], and Celko is a proper authority on the subject, he's been on the committee writing the SQL standard.

And then I'd also recommend this[^] article. It's having the benefit of explaining how in plain English being void of buzzwords.

How Can I Set Constraints According To A Colum Value In Table

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