Question

我想将2个查询的结果附加到一个结果集中。

SELECT n.member_no, n.surname, n.first_name
            FROM `names` AS n
            WHERE member_no = '1003';

SELECT s.registration
                FROM `system` AS s
                WHERE s.RECNUM = 1;

这必须返回一条记录，其中包含名称表中的数据以及系统（一条记录）表中的数据

Member_no | surname |  first_name  |  registration
--------------------------------------------------
  1003    |  Brown  |     Peter    |  My registration

Answer 1

您可以使用CrossJoin：

SELECT n.member_no, n.surname, n.first_name, s.registration
            FROM names AS n
            CROSS JOIN system s
            WHERE n.member_no = '1003' and s.RECNUM = 1;

Answer 2

我们可以基于registration关联您的name和row_number()表。您可能要尝试以下查询。

SELECT rn.member_no, rn.surname, n.first_name, s.registration
FROM
    (SELECT member_no, surname, first_name, row_number() over (order by member_no) rn
            FROM `names`) n           
LEFT JOIN 
    (SELECT row_number() over (order by RECNUM) rn, registration
                FROM `system`) s on s.rn = n.rn              
WHERE n.member_no = '1003'

Answer 3

尝试这个。

SELECT DISTINCT n.member_no, n.surname, n.first_name,s.registration
FROM `names` AS n, `system` AS s
WHERE s.RECNUM = 1 AND member_no = '1003';

合并没有联接或联合的2个查询的结果

3 个答案: