Tip: Check if a Primary Key Exists on a Table

You can use IF NOT EXISTS to check whether a Primary Key is missing and add it as follows:

IF NOT EXISTS (

SELECT * FROM sys.tables t

INNER JOIN sys.schemas s ON t.schema_id = s.schema_id

INNER JOIN sys.indexes i on i.object_id = t.object_id

WHERE i.is_primary_key = 1

AND s.name = 'dbo' AND t.name = 'TableName'

)

ALTER TABLE dbo.TableName

ADD CONSTRAINT PK_TableName PRIMARY KEY (

Column1

) WITH ( ONLINE = ON )

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