MySQL 5.6 - Complex table update - mysql

Question

I have two tables as follows:
Enclosure
+-------+--------------+-----------+-----------+
| name | serialnumber | VCenabled | BCenabled |
+-------+--------------+-----------+-----------+
| ENC01 | 12345 | | |
| ENC02 | 45678 | | |
| ENC03 | 11222 | | |
+-------+--------------+-----------+-----------+
Interconnect
+-------------+-----------+-----------------------+
| description | baynumber | enclosureserialnumber |
+-------------+-----------+-----------------------+
| VC | 1 | 12345 |
| VC | 2 | 12345 |
| BC | 3 | 12345 |
| VC | 1 | 45678 |
| BC | 3 | 45678 |
+-------------+-----------+-----------------------+
I need to update the VCenabled and BCenabled columns in the Enclosure table. VCenabled should contain a count of the corresponding rows in the Interconnect table. Likewise for BCenabled.
Here is what I need to end up with:
+-------+--------------+-----------+-----------+
| name | serialnumber | VCenabled | BCenabled |
+-------+--------------+-----------+-----------+
| ENC01 | 12345 | 2 | 1 |
| ENC02 | 45678 | 1 | 1 |
| ENC03 | 11222 | | |
+-------+--------------+-----------+-----------+
I was able to come up with this SQL query, but I'm not having much luck turning this into an update. Also, this query works if I run it in Flyspeed Query but if I run it in MySQL Workbench, I get a 1064 error: Error in SQL syntax.
Select
enclosure.name,
enclosure.vcenabled,
count(*)
From
enclosure Inner Join
interconnect On interconnect.enclosureserialnumber = enclosure.serialnumber
Where
interconnect.description like '%VC%'
Group By
enclosure.serialnumber
Any help would be appreciated.

Answer 1

try this :
update enclosure t1,
(select count(*) as x,enclosureserialnumber from interconnect where description='VC') t2,
(select count(*) as y,enclosureserialnumber from interconnect where description='BC') t3
set t1.VCenabled = t2.x,t1.BCenabled=t3.x
where t1.serialnumber=t2.enclosureserialnumber
and t2.serialnumber=t3.enclosureserialnumber

Answer 2

Sample
UPDATE
Enclosure e
INNER JOIN (
SELECT
enclosureserialnumber,
SUM(CASE WHEN description = 'VC' THEN 1 ELSE 0 END) AS VC,
SUM(CASE WHEN description = 'BC' THEN 1 ELSE 0 END) AS BC
FROM
Interconnect
GROUP BY
enclosureserialnumber
) q1
ON e.serialnumber = q1.enclosureserialnumber
SET
VCenabled = q1.VC,
BCenabled = q1.BC;

Answer 3

This should work using a subquery with the update:
update Enclosure e
join (
select enclosureserialnumber,
sum(case when i.description = 'VC' then 1 else 0 end) vcsum,
sum(case when i.description = 'BC' then 1 else 0 end) bcsum
from Interconnect i
group by i.enclosureserialnumber
) i
on e.serialnumber = i.enclosureserialnumber
set e.VCenabled = i.vcsum,
e.BCenabled = i.bcsum;
SQL Fiddle Demo

Answer 4

update Enclosure as E1 set E1.VCenabled = (select count(*) from Interconnect as I where I.enclosureserialnumber = E1.serialnumber and I.description = 'VC');
similar for BC
Tested... if any error occurs, please check for any spelling typos.
for output to my system....
http://pastebin.com/B0bUDYX6