SELECT   *

   FROM     ( SELECT    A.WS_ID ,

                        B.NEXT_OPERATOR

              FROM      ( SELECT    WS_ID ,

                                    [NEXT_OPERATOR] = CONVERT(XML, '<root><v>'

                                    + REPLACE([NEXT_OPERATOR], ',', '</v><v>')

                                    + '</v></root>')

                          FROM      WS_INST_STEP MYSTEP

                          WHERE     MYSTEP.NEXT_OPERATOR IS NOT NULL

                          GROUP BY  MYSTEP.WS_ID ,

                                    MYSTEP.NEXT_OPERATOR

                        ) A

                        OUTER APPLY ( SELECT    NEXT_OPERATOR = N.v.value('.',

                                                              'varchar(100)')

                                      FROM      A.[NEXT_OPERATOR].nodes('/root/v') N ( v )

                                    ) B

            ) TT

   WHERE    TT.NEXT_OPERATOR IN ( 870, 47, 51, 37, 60, 48, 46, 866, 54, 62, 63,

                                  30, 56, 36, 867, 28, 58, 31, 43, 45, 32, 42,

                                  65, 1892, 64, 40, 55, 34, 50, 53, 29, 57, 59,

                                  44, 795, 41, 52, 35, 33, 869, 868, 1891, 38,

                                  39, 49, 61 )

SELECT   WS_ID ,

                        OPERATOR_AND_NEXT_OPERATOR = STUFF(( SELECT

                                                              ','

                                                              + T_STEP_0.NEXT_OPERATOR

                                                             FROM

                                                              WS_INST_STEP AS T_STEP_0

                                                             WHERE

                                                              T_STEP_0.WS_ID = T_STEP_1.WS_ID

                                                           FOR

                                                             XML

                                                              PATH('')

                                                           ), 1, 1, '') + ','

                        + STUFF(( SELECT    ',' + T_STEP_0.OPERATOR

                                  FROM      WS_INST_STEP AS T_STEP_0

                                  WHERE     T_STEP_0.WS_ID = T_STEP_1.WS_ID

                                FOR

                                  XML PATH('')

                                ), 1, 1, '')

               FROM     WS_INST_STEP T_STEP_1

               GROUP BY WS_ID