如何将这两个查询合并在一起？

Question

SELECT MIN( a.severity ), CONCAT_WS(",", a.dev_id, a.object_id ) AS tuple 
FROM net.alerts AS a INNER JOIN net.deviceinfo AS c ON c.id = a.dev_id AND 
c.peer = ( SELECT value FROM local.settings WHERE setting="server_id" ) WHERE 1 
AND (a.dev_id, a.object_id) IN ( (13,4164),(45,-1),(145,995),(188,-1) ) GROUP BY tuple


SELECT MIN( a.severity ), CONCAT_WS(",", b.device_id, b.object_id ) AS tuple 
FROM net.alerts AS a INNER JOIN local.conditions AS b ON a.condition_id = b.condition_id WHERE 1 
AND(b.device_id, b.object_id) IN ((13,4164),(45,-1),(145,995),(188,-1) ) Group BY tuple

I have these tables, and in the alerts and conditions tables, they all have the device_id and object_id, but they maybe different, so I'm trying to retrieve all data of that composite.

Answer 1

I'm not sure I understand what you try to do but I guess you need to use UNION .

By the way why do you write WHERE 1 AND condition and not WHERE condition ?

Answer 2

Probably it'd be best to work on a single query, but maybe UNION would work for you as you say you just want to merge the result:

(SELECT MIN( a.severity ), CONCAT_WS(",", a.dev_id, a.object_id ) AS tuple 
FROM net.alerts AS a INNER JOIN net.deviceinfo AS c ON c.id = a.dev_id AND 
c.peer = ( SELECT value FROM local.settings WHERE setting="server_id" ) WHERE 1 AND 
(a.dev_id, a.object_id) IN ( (13,4164),(45,-1),(145,995),(188,-1) ))

UNION 

(SELECT MIN( a.severity ), CONCAT_WS(",", b.device_id, b.object_id ) AS tuple 
FROM net.alerts AS a INNER JOIN local.conditions AS b ON 
a.condition_id = b.condition_id WHERE 1 AND(b.device_id, b.object_id) IN ((13,4164),
(45,-1),(145,995),(188,-1) ))

• Use "UNION ALL" to allow duplicate values

Answer 3

You neeed to use union or union all , depending on what kind of join you want. So for twi qyery results n1 and n2 :

• Union - x < n1+n2 - will remove duplicates
• Union All - x == n1+n2 -will save duplicates

So your code should look like this:

(SELECT MIN( a.severity ), CONCAT_WS(",", a.dev_id, a.object_id ) AS tuple 
FROM net.alerts AS a INNER JOIN net.deviceinfo AS c ON c.id = a.dev_id AND 
c.peer = ( SELECT value FROM local.settings WHERE setting="server_id" ) WHERE 1 
AND (a.dev_id, a.object_id) IN ( (13,4164),(45,-1),(145,995),(188,-1) ) GROUP BY tuple)

 UNION

(SELECT MIN( a.severity ), CONCAT_WS(",", b.device_id, b.object_id ) AS tuple 
FROM net.alerts AS a INNER JOIN local.conditions AS b ON a.condition_id = b.condition_id WHERE 1 
AND(b.device_id, b.object_id) IN ((13,4164),(45,-1),(145,995),(188,-1) ) Group BY tuple)

You ned to remember: number and names of your query columns must match exactly.