union:列名称应该相同，列的数据类型应该相通

          不返回重复的值

create(:Creditcard{number:111111,name:"aaaaaa"}),(:Creditcard{number:222222,name:"bbbbbb"})

 

create(:Debitcard{number:111,name:"aaa"}),(:Debitcard{number:222,name:"bbb"})

 

match(cc:Creditcard)

return cc.id as id,cc.number as number,cc.name as name

union

match(dc:Debitcard)

return dc.id as id,dc.number as number,dc.name as name