sp_pkeys (Transact-SQL MetaData) Definition

Please note: that the following source code is provided and copyrighted by Microsoft and is for educational purpose only.
The meta data is from an SQL 2012 Server.

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Definition:

sys.sp_pkeys(nvarchar @table_name
, nvarchar @table_owner
, nvarchar @table_qualifier)

MetaData:

   
create procedure sys.sp_pkeys  
(  
    @table_name      sysname,  
    @table_owner     sysname = null,  
    @table_qualifier sysname = null  
)  
as  
    declare @table_id           int  
    --  quotename() returns up to 258 chars  
    declare @full_table_name    nvarchar(517) --  258 + 1 + 258  
  
    if @table_qualifier is not null  
    begin  
        if db_name() <> @table_qualifier  
        begin   --  If qualifier doesn't match current database  
            raiserror (15250, -1,-1)  
            return  
        end  
    end  
  
    if @table_owner is null  
    begin   --  If unqualified table name  
        select @full_table_name = quotename(@table_name)  
    end  
    else  
    begin   --  Qualified table name  
        if @table_owner = ''  
        begin   --  If empty owner name  
            select @full_table_name = quotename(@table_owner)  
        end  
        else  
        begin  
            select @full_table_name = quotename(@table_owner) + '.' + quotename(@table_name)  
        end  
    end  
  
    select @table_id = object_id(@full_table_name)  
  
    select  
        TABLE_QUALIFIER = convert(sysname,db_name()),  
        TABLE_OWNER = convert(sysname,schema_name(o.schema_id)),  
        TABLE_NAME = convert(sysname,o.name),  
        COLUMN_NAME = convert(sysname,c.name),  
        KEY_SEQ = convert (smallint,  
            case  
                when c.name = index_col(@full_table_name, i.index_id,  1) then 1  
                when c.name = index_col(@full_table_name, i.index_id,  2) then 2  
                when c.name = index_col(@full_table_name, i.index_id,  3) then 3  
                when c.name = index_col(@full_table_name, i.index_id,  4) then 4  
                when c.name = index_col(@full_table_name, i.index_id,  5) then 5  
                when c.name = index_col(@full_table_name, i.index_id,  6) then 6  
                when c.name = index_col(@full_table_name, i.index_id,  7) then 7  
                when c.name = index_col(@full_table_name, i.index_id,  8) then 8  
                when c.name = index_col(@full_table_name, i.index_id,  9) then 9  
                when c.name = index_col(@full_table_name, i.index_id, 10) then 10  
                when c.name = index_col(@full_table_name, i.index_id, 11) then 11  
                when c.name = index_col(@full_table_name, i.index_id, 12) then 12  
                when c.name = index_col(@full_table_name, i.index_id, 13) then 13  
                when c.name = index_col(@full_table_name, i.index_id, 14) then 14  
                when c.name = index_col(@full_table_name, i.index_id, 15) then 15  
                when c.name = index_col(@full_table_name, i.index_id, 16) then 16  
            end),  
        PK_NAME = convert(sysname,k.name)  
    from  
        sys.indexes i,  
        sys.all_columns c,  
        sys.all_objects o,  
        sys.key_constraints k  
    where  
        o.object_id = @table_id and  
        o.object_id = c.object_id and  
        o.object_id = i.object_id and  
        k.parent_object_id = o.object_id and   
        k.unique_index_id = i.index_id and   
        i.is_primary_key = 1 and  
        (c.name = index_col (@full_table_name, i.index_id,  1) or  
         c.name = index_col (@full_table_name, i.index_id,  2) or  
         c.name = index_col (@full_table_name, i.index_id,  3) or  
         c.name = index_col (@full_table_name, i.index_id,  4) or  
         c.name = index_col (@full_table_name, i.index_id,  5) or  
         c.name = index_col (@full_table_name, i.index_id,  6) or  
         c.name = index_col (@full_table_name, i.index_id,  7) or  
         c.name = index_col (@full_table_name, i.index_id,  8) or  
         c.name = index_col (@full_table_name, i.index_id,  9) or  
         c.name = index_col (@full_table_name, i.index_id, 10) or  
         c.name = index_col (@full_table_name, i.index_id, 11) or  
         c.name = index_col (@full_table_name, i.index_id, 12) or  
         c.name = index_col (@full_table_name, i.index_id, 13) or  
         c.name = index_col (@full_table_name, i.index_id, 14) or  
         c.name = index_col (@full_table_name, i.index_id, 15) or  
         c.name = index_col (@full_table_name, i.index_id, 16))  
           
    order by 1, 2, 3, 5