我有表客户
customerno sname contactid address
1 aaa 101 north
1 bbb 102 south
1 ccc 103 west
2 ddd 104 south
2 ccc 105 north
2 eee 106 null
我想将特定的客户详细信息转换为单行。我想要这样的结果
Customerno sname1 sname2 sname3 address1 address2 address3
1 aaa bbb ccc north south west
2 ddd ccc eee south north null
帮我 ........