Postgresql PSQL-如何选择两列的组合？

我有一个列如下的表：

User
   id integer;
   firstName varchar;
   lastName varchar;
   employee_id integer;

User(1,"John","Dake",123)
User(2,"John","Daniel",124)
User(3,"Richard","Johnson",125)
User(4,"Peter","Federo",126)
User(5,"George","Daniel",127)

现在，表中的数据如下所示：

User
   id integer;
   firstName varchar;
   lastName varchar;
   employee_id integer;

User(1,"John","Dake",123)
User(2,"John","Daniel",124)
User(3,"Richard","Johnson",125)
User(4,"Peter","Federo",126)
User(5,"George","Daniel",127)

我需要实现一个名-姓组合的搜索。假设搜索查询是johnd，那么输出应该是前两行。是否可以在不创建新视图或表的情况下编写这样的查询来获取输出？

试试这个

SELECT * FROM demo WHERE firstName||' '||lastName LIKE '%John D%'

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