SQL根据列选择多行数据

Question

我想编写一个Oracle sql查询，它将按以下顺序获取数据：

NAME    Phone1  Phone2
JOHN    1123     321
RIK 11  Null
KATE    Null    21

输出：

NAME    PHONE
JOHN    1123
JOHN    321
RIK 11
KATE    21

Answer 1

您可以尝试使用UNION ALL

select name, phone1 as phone from tablenmae
union all
select name, phone2  from tablenmae

或者您可以尝试使用UNPVOT

select *
  from tablenmae
unpivot
(
    phone
    for val in (phone1, phone2)
)

Answer 2

我们可以在此处尝试使用UNION ALL

SELECT NAME, Phone1 AS PHONE FROM yourTable WHERE Phone1 IS NOT NULL
UNION ALL
SELECT NAME, Phone2 FROM yourTable WHERE Phone2 IS NOT NULL
ORDER BY NAME, PHONE;

Demo

Answer 3

从表1中选择名称，电话1，其中电话1不为空 工会
从table1中选择名称，phone2，其中phone2不为空