The starting table.

with t1 as 
(
Select 'obrien-t j' lname_forename_long,11 grid_id_ct ,'grid.416153.4' grid_id,2 name_seq ,1 group_seq UNION ALL
Select 'obrien-t j',1,'grid.1002.3',1,1 UNION ALL
Select 'obrien-terence',2,'grid.1008.9',1,2 UNION ALL
Select 'obrien-terence',4,'grid.416153.4',2,2 UNION ALL
Select 'obrien-terence',1,'grid.484852.7',3,2 UNION ALL
Select 'obrien-terence j',14,'grid.1002.3',1,3 UNION ALL
Select 'obrien-terence j',25,'grid.1008.9',2,3 UNION ALL
Select 'obrien-terence j',3,'grid.1019.9',3,3 UNION ALL
Select 'obrien-terence j',9,'grid.1623.6',4,3 UNION ALL
Select 'obrien-terence j',40,'grid.237081.f',5,3 UNION ALL
Select 'obrien-terence j',1,'grid.267362.4',6,3 UNION ALL
Select 'obrien-terence j',2,'grid.414094.c',7,3 UNION ALL
Select 'obrien-terence j',1,'grid.416060.5',8,3 UNION ALL
Select 'obrien-terence j',36,'grid.416153.4',9,3 UNION ALL
Select 'obrien-terence j',4,'grid.453219.8',10,3 UNION ALL
Select 'obrien-terence j',3,'grid.454055.5',11,3 UNION ALL
Select 'obrien-terence j',6,'grid.474069.8',12,3 UNION ALL
Select 'obrien-terence j',13,'grid.481253.9',13,3 UNION ALL
Select 'obrien-terence john',1,'grid.1002.3',1,4 UNION ALL
Select 'obrien-terence john',1,'grid.1008.9',2,4 UNION ALL
Select 'obrien-terence john',1,'grid.1623.6',3,4 UNION ALL
Select 'obrien-terence john',1,'grid.237081.f',4,4 UNION ALL
Select 'obrien-terence john',2,'grid.416153.4',5,4 UNION ALL
Select 'obrien-terrence',2,'grid.416153.4',1,5 UNION ALL
Select 'obrien-terrence j',1,'grid.416153.4',1,6 UNION ALL
Select 'obrien-terry',1,'grid.137628.9',1,7 UNION ALL
Select 'obrien-terry',2,'grid.237081.f',2,7 UNION ALL
Select 'obrien-terry',1,'grid.267362.4',3,7 UNION ALL
Select 'obrien-timothy',1,'grid.496867.2',1,8 UNION ALL
Select 'obrien-timothy',3,'grid.6142.1',2,8 
)
select * from t1;

END RESULT