How can add a new column as a Primary Key without Losing my Data - SQL Script

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SQL-Server-2012

I have an existing table 'AccountMappingMaster'
with already 4 primary key
and now I just want to add a new column as primary key also without losing my data.

I've tried Drop and Create but If I have to do it, I have to use Insert to recover my data. But I have a lot of data and it would take time to make it done.

please someone help me. Thanks

Posted 21-Sep-15 16:58pm

qwerzxcxyz

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Abhinav S · Accepted Answer · 2015-09-21T17:09:00

Solution 1

Try the following
1) drop the constraint on the table
2) add the column
3) add data in this column
4) make a new primary key with the 5 fields

To get a list of constraints on the table, try

SQL

select OBJECT_NAME(OBJECT_ID) AS constrnt
FROM sys.objects
where OBJECT_NAME(parent_object_id)='AccountMappingMaster'
and type_desc LIKE '%CONSTRAINT'

Posted 21-Sep-15 17:09pm

Abhinav S

Comments

qwerzxcxyz 21-Sep-15 23:46pm

I've try this and it works, thanks a lot

aarif moh shaikh 22-Sep-15 0:31am

good one... 5

Abhinav S 22-Sep-15 1:42am

Thanks.