match (a:n_ex{id:'1'})
delete a
return a
match (a:n_ex)
where a.id='1'
delete a
return a
match (a:n_ex{id:'1'})-[r:r_ex]->(b:n_ex{id:'2'})
delete r
return r
match (a:n_ex)-[r:r_ex]->(b:n_ex)
where a.id='1' and b.id='2'
delete r
return r
match (a:n_ex{id:'1'})
detach delete a