使用 select 将行添加到查询结果

2022-01-09 00:00:00 sql select insert tsql sql-server

是否可以用这样的文字扩展查询结果?

Is it possible to extend query results with literals like this?

select name from users
union
select name from ('JASON');

或

select age, name from users
union
select age, name from (25,'Betty');

所以它返回表中的所有名称加上JASON"或 (25,'Betty').

so it returns all the names in the table plus 'JASON', or (25,'Betty').

推荐答案

你这样使用它:

SELECT  age, name
FROM    users
UNION
SELECT  25 AS age, 'Betty' AS name

使用 UNION ALL 允许重复:如果您的用户中有一个 25 岁的 Betty，则第二个查询将不会再仅使用 UNION 选择她.

Use UNION ALL to allow duplicates: if there is a 25-years old Betty among your users, the second query will not select her again with mere UNION.

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