sql - 显示所有列，其中一列被屏蔽

Question

我有两列 - 名称和 ccNumber。我想显示两个列，其中一个被屏蔽。

此查询仅显示一列，但我希望显示所有列：

declare @t table (card_no varchar(20))
insert into @t
select ccNUMBER from ccinfo 
select 'XXXX-XXXX-XXXX-'+ substring(card_no, 13, 4) as card_no from @t

我想屏蔽带有 ccnumber 列的名称列

Answer 1

你可以试试下面

declare @t table (name varchar(100),card_no varchar(20))
insert into @t
select name, ccNUMBER from ccinfo 
select name, 'XXXX-XXXX-XXXX-'+ substring(card_no, 13, 4) as card_no from @t

Answer 2

您还需要获得第二列：

declare @t table (card_no varchar(20), name varchar(64));

insert into @t
select ccNUMBER, name from ccinfo 

select 'XXXX-XXXX-XXXX-'+ substring(card_no, 13, 4) as card_no, name from @t

或者只使用原始表：

select 'XXXX-XXXX-XXXX-'+ substring(ccNUMBER, 13, 4) as card_no, name from ccinfo

Answer 3

检查以下示例。我认为您需要连接列。

create table demo

(
   firstName varchar(30),
    secondName varchar(30)
);

 insert into demo
 values
  ('soumyajit', 'chatterjee'),
  ('papai', 'chatterjee'),
  ('virat', 'kohli');


  select concat(firstName, ' ', secondName)as Name from demo;