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Wiki  >  TechNet Articles  >  Script to Create or Drop All Primary Keys

Script to Create or Drop All Primary Keys

Script to Create or Drop All Primary Keys

I wrote a script to generate create or drop statements for all primary keys in a SQL Server database. It was originally published on my blog in 2009, but this is a better place to post it. The community has the ability to correct or enhance the script here. I did not test the script on a database that has partitioned tables or partitioned indexes. Hopefully someone can test it on a partitioned database and update this Wiki post if necessary.


To generate drop statements, uncomment the statement that sets @action to DROP and comment out the statement that sets @action to CREATE.

 
DECLARE @object_id int;
DECLARE @parent_object_id int;
DECLARE @TSQL NVARCHAR(4000);
DECLARE @COLUMN_NAME SYSNAME;
DECLARE @is_descending_key bit;
DECLARE @col1 BIT;
DECLARE @action CHAR(6);
 
--SET @action = 'DROP';
SET @action = 'CREATE';
 
DECLARE PKcursor CURSOR FOR
    select kc.object_id, kc.parent_object_id
    from sys.key_constraints kc
    inner join sys.objects o
    on kc.parent_object_id = o.object_id
    where kc.type = 'PK' and o.type = 'U'
    and o.name not in ('dtproperties','sysdiagrams')  -- not true user tables
    order by QUOTENAME(OBJECT_SCHEMA_NAME(kc.parent_object_id))
            ,QUOTENAME(OBJECT_NAME(kc.parent_object_id));
 
OPEN PKcursor;
FETCH NEXT FROM PKcursor INTO @object_id, @parent_object_id;
  
WHILE @@FETCH_STATUS = 0
BEGIN
    IF @action = 'DROP'
        SET @TSQL = 'ALTER TABLE '
                  + QUOTENAME(OBJECT_SCHEMA_NAME(@parent_object_id))
                  + '.' + QUOTENAME(OBJECT_NAME(@parent_object_id))
                  + ' DROP CONSTRAINT ' + QUOTENAME(OBJECT_NAME(@object_id))
    ELSE
        BEGIN
        SET @TSQL = 'ALTER TABLE '
                  + QUOTENAME(OBJECT_SCHEMA_NAME(@parent_object_id))
                  + '.' + QUOTENAME(OBJECT_NAME(@parent_object_id))
                  + ' ADD CONSTRAINT ' + QUOTENAME(OBJECT_NAME(@object_id))
                  + ' PRIMARY KEY'
                  + CASE INDEXPROPERTY(@parent_object_id
                                      ,OBJECT_NAME(@object_id),'IsClustered')
                        WHEN 1 THEN ' CLUSTERED'
                        ELSE ' NONCLUSTERED'
                    END
                  + ' (';
 
        DECLARE ColumnCursor CURSOR FOR
            select COL_NAME(@parent_object_id,ic.column_id), ic.is_descending_key
            from sys.indexes i
            inner join sys.index_columns ic
            on i.object_id = ic.object_id and i.index_id = ic.index_id
            where i.object_id = @parent_object_id
            and i.name = OBJECT_NAME(@object_id)
            order by ic.key_ordinal;
 
        OPEN ColumnCursor;
 
        SET @col1 = 1;
 
        FETCH NEXT FROM ColumnCursor INTO @COLUMN_NAME, @is_descending_key;
        WHILE @@FETCH_STATUS = 0
        BEGIN
            IF (@col1 = 1)
                SET @col1 = 0
            ELSE
                SET @TSQL = @TSQL + ',';
 
            SET @TSQL = @TSQL + QUOTENAME(@COLUMN_NAME)
                      + ' '
                      + CASE @is_descending_key
                            WHEN 0 THEN 'ASC'
                            ELSE 'DESC'
                        END;
 
            FETCH NEXT FROM ColumnCursor INTO @COLUMN_NAME, @is_descending_key;
        END;
 
        CLOSE ColumnCursor;
        DEALLOCATE ColumnCursor;
 
        SET @TSQL = @TSQL + ');';
 
        END;
 
    PRINT @TSQL;
 
    FETCH NEXT FROM PKcursor INTO @object_id, @parent_object_id;
END;
 
CLOSE PKcursor;
DEALLOCATE PKcursor;






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  • 22 Sep 2013 3:45 AM

    Maheshkumar S Tiwari edited Revision 3. Comment: Added tags

  • 25 Apr 2011 9:03 AM

    Ed Price MSFT edited Revision 2. Comment: Updating title case to guidelines.

  • 21 Apr 2011 2:57 PM

    John Paul Cook edited Revision 1. Comment: Added a correction made by Adriaan Van Bauwel.

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  • Posted by
    on 21 Apr 2011 2:57 PM

    John Paul Cook edited Revision 1. Comment: Added a correction made by Adriaan Van Bauwel.

  • Posted by
    on 25 Apr 2011 9:03 AM

    Ed Price MSFT edited Revision 2. Comment: Updating title case to guidelines.

  • Posted by
    on 22 Sep 2013 3:45 AM

    Maheshkumar S Tiwari edited Revision 3. Comment: Added tags

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