创建一个汇总4个元组的VIEW

Question

我想创建一个重新格式化我的数据的SQL VIEW

这是我创建的表格。由于端口需要唯一，因此我将它们放在一栏中：

MariaDB [admindb]> select * from table_tennant;
+-------+----------+--------------+----------------+
| port  | protocol | tennant_name | tennant_domain |
+-------+----------+--------------+----------------+
| 10000 | https    | test         | test.test.de   |
| 10001 | smtp     | test         | test.test.de   |
| 10002 | mgmt     | test         | test.test.de   |
| 10003 | solr     | test         | test.test.de   |
| 10010 | https    | test2        | test2.test.de  |
| 10011 | smtp     | test2        | test2.test.de  |
| 10012 | mgmt     | test2        | test2.test.de  |
| 10013 | solr     | test2        | test2.test.de  |
+-------+----------+--------------+----------------+

每个租户的4行应显示为一个，像这样

+----------------+--------------+------------+-----------+-----------+-----------+
| tennant_domain | tennant_name | https_port | smtp_port | mgmt_port | solr_port |
+----------------+--------------+------------+-----------+-----------+-----------+
| test.test.de   | test         |      10000 |     10001 |     10002 |     10003 |
+----------------+--------------+------------+-----------+-----------+-----------+

这仅适用于表中的Tennant之一。如果我再输入第二个，则SELECT语句的VIEW返回多个结果，这将导致错误。]

MariaDB [admindb]> select * from view_ausgabe;
ERROR 1242 (21000): Subquery returns more than 1 row"

这是我的VIEW定义

MariaDB [admindb]> CREATE VIEW view_ausgabe AS SELECT tennant_domain, tennant_name,
    -> (SELECT port from table_tennant WHERE protocol = 'https' GROUP BY tennant_name AND tennant_domain) AS https_port,
    -> (SELECT port from table_tennant WHERE protocol = 'smtp' GROUP BY tennant_name AND tennant_domain) AS smtp_port,
    -> (SELECT port from table_tennant WHERE protocol = 'mgmt' GROUP BY tennant_name AND tennant_domain) AS mgmt_port,
    -> (SELECT port from table_tennant WHERE protocol = 'solr' GROUP BY tennant_name AND tennant_domain) AS solr_port
    -> FROM table_tennant GROUP BY tennant_name;
如何在VIEW中为每个租户创建一个新行？

感谢您的帮助。安德烈

我想创建一个SQL VIEW来重新格式化我创建的表的数据。由于端口需要唯一，因此我将它们放在一列中：MariaDB [admindb

Answer 1

使用条件聚合：

create view view_ausgabe as
select 
    tennant_domain,
    tennant_name,
    max(case when protocal = 'https' then port end) https_port,
    max(case when protocal = 'smtp'  then port end) smtp_port,
    max(case when protocal = 'mngt'  then port end) mngt_port,
    max(case when protocal = 'solr'  then port end) solr_port   
from mytable
group by tennant_domain, tennant_name