I have a MySQL problem I can not get to solve. I have a mysql to manage a virtual user dovecot installation, that uses two tables (one for the aliases, another for the domains).
The table aliases has these fields: domain_id(INT), source(VARCHAR), destination(VARCHAR), whereas table domains has only two fields: id (INT AUTO INC) and name (VARCHAR).
Although I'm able to select aliases that belong to a given domain by issuing:
SELECT valias.* FROM aliases AS valias
JOIN domains AS vdomains ON valias.domain_id=vdomains.id
WHERE vdomains.name = "domain_name";
I can not get to work to insert a new alias, specifing the domain name. something like this:
INSERT INTO valias(domain_id, source, destination)
VALUES (id, 'canto', 'george')
SELECT id FROM aliases
JOIN domains AS vdomains ON aliases.domain_id=vdomains.id
WHERE vdomains.name = "domain_name";
Does somebody know how to solve this problem?
My experience is mainly in MS SQL Server, but I reckon it should go the same way in MySQL:
INSERT INTO valias(domain_id, source, destination)
SELECT id, 'canto', 'george' FROM vdomains
WHERE name = 'domain_name';
Either I'm missing something here or your query seems a bit to overingeenered. How about this:
INSERT INTO aliases(domain_id, source, destination)
VALUES (id, 'canto', 'george')
JOIN domains ON domains.id = aliases.domain_id
WHERE domains.name = 'domain name'
Try this,
INSERT INTO valias(domain_id, source, destination)
SELECT id,'canto', 'george'
FROM aliases
JOIN domains AS vdomains
ON aliases.domain_id=vdomains.id
WHERE vdomains.name = "domain_name";
Related
I'm working with mySQL db and trying to display the correct data for the user. In order to do that I check if the data that I call from one backend is equal to username from another backend like so
SELECT * FROM db1 WHERE db1.table.value = db2.table.value
Names of databases are A and B.
SELECT *
FROM `A.onboardings`
, `B.loginsystem`
WHERE onboardings.sales_email = loginsystem.username
The problem is I get an error A.A.onboardings doesn't exists and A.B.loginsystem doesn't exist pls help :(
You must use this form - from A onboardings
You have to put the backticks in the right pace, or else mysql things your table is called A.onboardings
As seen bleow the needs to be around the database and the table name
And the use of aliases helps to keep even in big queries a good overview and yu have to write less
"SELECT * FROM `A`.`onboardings` a1,`B`.`loginsystem` b1 WHERE a1.sales_email = b1.username"
Try this one( Change the query according to your DB name, table, and matching column name)
SELECT * FROM mydatabase1.tblUsers INNER JOIN mydatabase2.tblUsers ON mydatabase1.tblUsers.UserID = mydatabase2.tblUsers.UserID
The problem is that
`A.onboardings`
is not the same as
A.onboardings
The first is a table reference where there table name has a period in it. The second is for the onboardings table in database A.
In addition, you should be using JOIN!!!
SELECT *
FROM A.onboardings o JOIN
B.loginsystem ls
ON o.sales_email = ls.username;
If you feel compelled to escape the identifies -- which I do not recommend -- then:
SELECT *
FROM `A`.`onboardings` o JOIN
`B`.`loginsystem` ls
ON o.sales_email = ls.username;
REPLACE INTO `Lehrling` (`idLehrling`,`Nachname`,`Vorname`,`Aufnahmedatum`,`Austrittsdatum`,`Klasse`,`Klassensprecher`,`Betriebe_idBetriebe`,`Ausbildungsberufe_idAusbildungsberufe`,`Credentials_idCredentials`) VALUES (1,'Krahn','Daniel','09.02.2015','31.12.2015','FI31',0,1,3,1);
REPLACE INTO `Credentials` (`idCredentials`,`Benutzername`,`Passwort`,`Anlegedatum`) VALUES (1,'krahnd','osz123','10.02.2015');
My goal is to select Nachname,Vorname from 'Lehrling' where Klasse is 'FI31' and also select Benutzername,Passwort from Credentials through the 'idCredentials' at the same time.
This process is called joining:
Select Lehrling.Nachname, Lehrling.Vorname, Credentials.Benutzername, Credentials.Passwort
From Lehrling
inner join Credentials on Credentials.idCredentials = Lehrling.Credentials_idCredentials
Where Lehrling.Klasse = 'FI31'
I'm trying to figure out why this code doesn't work; i'm trying to select "upgrades" from the database that the user doesn't already have. I've done it two ways
This Way:
SELECT id, name, cost, prereq, nullif FROM upgrades WHERE NOT IN (Select upgrade_id FROM user_upgrades WHERE uid = :uid);
and this way:
SELECT id, name, cost, prereq, nullif FROM upgrades WHERE NOT IN (:ID)
in which the :ID tag isa list of user upgrades pulled through a function in PHP. Neither one of these codes are working--they do not show any results whats so ever.
You forgot the attribute in the condition after WHERE:
WHERE "MISSING ATTRIBUTE" NOT IN ...
I have a table (netStream), that has 2 foreign keys: (logSessions_logSessionID) and (accountSessions_accountSessionID).
The (logSessions_logSessionID) is mandatory the (accountSessions_accountSessionID) is NOT mandatory.
Here is the part of the block-scheme that shows the connections and the non-mandatory status:
(The background: logSessions are the sessions that every visitor have, accountSessions are the login sessions. Everybody has a logSession (since everybody is a visitor), but not everybody is logged in, so they do not have accountSession)
I want to insert a row into (netStream), in every case there is a (logSession), but it is not the same with (accountSession). So, when there is an (accountSession), I want to insert that ID too, if there is no (accountSession), then just leave that field in (netStream) NULL.
The hash values are stored in Binary(x), this is why I use UNHEX().
This is the MySQL I wrote, there is no error message, but it does not work. What is the problem?
INSERT INTO `test-db`.`netStream` (`netStreamHash`, `logSessions_logSessionID`, `accountSessions_accountSessionID`)
SELECT UNHEX("1faab"), `logSessions`.`logSessionID`, NULL FROM `logSessions` CROSS JOIN `accountSessions`
WHERE `logSessions`.`logSessionHash` = UNHEX("aac") AND
`accountSessions`.`accountSessionHash` = UNHEX("2fb");
If understand you correctly you are probably looking for something like this
INSERT INTO `test-db`.`netStream` (
`netStreamHash`,
`logSessions_logSessionID`,
`accountSessions_accountSessionID`)
SELECT UNHEX("1faab"),
(SELECT `logSessionID` FROM `logSessions`
WHERE `logSessionHash` = UNHEX("aac")),
(SELECT `accountSessionID` FROM `accountSessions`
WHERE `accountSessionHash` = UNHEX("2fb"));
If there is no matching row in accountSessions then you'll get NULL inserted in accountSessions_accountSessionID in netStream table
I have a table with the following fields:
id | domainname | domain_certificate_no | keyvalue
An example for the output of a select statement can be as:
'57092', '02a1fae.netsolstores.com', '02a1fae.netsolstores.com_1', '55525772666'
'57093', '02a1fae.netsolstores.com', '02a1fae.netsolstores.com_2', '22225554186'
'57094', '02a1fae.netsolstores.com', '02a1fae.netsolstores.com_3', '22444356259'
'97168', '02aa6aa.netsolstores.com', '02aa6aa.netsolstores.com_1', '55525772666'
'97169', '02aa6aa.netsolstores.com', '02aa6aa.netsolstores.com_2', '22225554186'
'97170', '02aa6aa.netsolstores.com', '02aa6aa.netsolstores.com_3', '22444356259’
I need to sanitize my db such that: I want to remove the domain names that have repeated keyvalue for the first domain_certificate_no (i.e, in this example, I look for the field domain_certificate_no: 02aa6aa.netsolstores.com_1, since it is number 1, and has repeated value for the key, then I want to remove the whole chain which is 02aa6aa.netsolstores.com_2 and 02aa6aa.netsolstores.com_3 and this by deleting the domain name that this chain belongs to which is 02aa6aa.netsolstores.com.
How can I automate the checking process for the whole DB. So, I have a query that checks any domain name in the pattern ('%.%.%) EDIT: AND they have share domain name (in this ex: netsolstores.com) , if it finds cert no. 1 that belongs to this domain name has a repeated key value, then delete. Otherwise no. Please, note tat, it is ok for domain_certificate_no to have repeated value if it is not number 1.
EDIT: I only compare the repeated valeues for the same second level domain name. Ex: in this question, I compare the values that share the domain name: .netsolstores.com. If I have another domain name, with sublevel domains, I do the same. But the point is that I don't need to compare the whole DB. Only the values with shared domain name (but different sub domain).
I'm not sure what happens with '02aa6aa.netsolstores.com_1' in your example.
The following keeps only the minimum id for any repeated key:
with t as (
select t.*,
substr(domain_certificate_no,
instr(domain_certificate_no, '_') + 1, 1000) as version,
left(domain_certificate_no, instr(domain_certificate_no, '_') - 1) as dcn
from t
)
select t.*
from t join
(select keyvalue, min(dcn) as mindcn
from t
group by keyvalue
) tsum
on t.keyvalue = tsum.keyvalue and
t.dcn = tsum.mindcn
For the data you provide, this seems to do the trick. This will not return the "_1" version of the repeats. If that is important, the query can be pretty easily modified.
Although I prefer to be more positive (thinking about the rows to keep rather than delete), the following should delete what you want:
with t as (
select t.*,
substr(domain_certificate_no,
instr(domain_certificate_no, '_') + 1, 1000) as version,
left(domain_certificate_no, instr(domain_certificate_no, '_') - 1) as dcn
from t
),
tokeep as (
select t.*
from t join
(select keyvalue, min(dcn) as mindcn
from t
group by keyvalue
) tsum
on t.keyvalue = tsum.keyvalue and
t.dcn = tsum.mindcn
)
delete from t
where t.id not in (select id from tokeep)
There are other ways to express this that are possibly more efficient (depending on the database). This, though, keeps the structure of the original query.
By the way, when trying new DELETE code, be sure that you stash a copy of the table. It is easy to make a mistake with DELETE (and UPDATE). For instance, if you leave out the WHERE clause, all the rows will disappear, after the long painful process of logging all of them. You might find it faster to simply select the desired results into a new table, validate them, then truncate the old table and re-insert them.