A misconfigured manual import imported our entire AD into our help desk user database, creating a bunch of extraneous/duplicate accounts. Of course, no backup to restore from.
To facilitate the cleanup, I want to run a query that will find users not currently linked to any current or archived tickets. I have three tables, USER, HD_TICKET, and HD_ARCHIVE_TICKET. I want to compare the ID field in USER to the OWNER_ID and SUBMITTER_ID fields in the other two tables, returning the only the values in USER.ID that do not exist in any of the other four columns.
How can this be accomplished?
Do a left join for each relationship where the right table id is null:
select user.*
from user
left join hd_ticket on user.id = hd_ticket.owner_id
left join hd_ticket as hd_ticket2 on user.id = hd_ticket2.submitter_id
left join hd_archive_ticket on user.id = hd_archive_ticket.owner_id
left join hd_archive_ticket as hd_archive_ticket2 on user.id = hd_archive_ticket2.submitter_id
where hd_ticket.owner_id is null
and hd_ticket2.submitter_id is null
and hd_archive_ticket.owner_id is null
and hd_archive_ticket2.submitter_id is null
How about something like:
SELECT id
FROM user
WHERE id NOT IN
(
SELECT owner_id
FROM hd_ticket
UNION ALL
SELECT submitter_id
FROM hd_ticket
UNION ALL
SELECT owner_id
FROM hd_archive_ticket
UNION ALL
SELECT submitter_id
FROM hd_archive_ticket
)
If I understood you situation I would do this:
SELECT a.id FROM user a, hd_ticket b, hd_archive_ticket c WHERE a.id != b.id AND a.id != c.id
You would want to try something like below. Inner query where I am doing Inner join with other 2 tables, will return only those user id which exist in all 3 tables. Then in your outer query I am just filtering out those ID's returned by inner query; since your goal is to get only those USER ID which is not present in other tables.
select ID
FROM USER
WHERE ID NOT IN
(
select u.ID
from user u
inner join HD_TICKET h on u.ID = h.OWNER_ID
inner join HD_ARCHIVE_TICKET ha on u.ID = ha.SUBMITTER_ID
)
Related
I want to improve my search performance. I want to search the user against the services and specialty. user in listed as per the filter applied either by specialty or by services or can be both.There are 5 tables i want to get the data from all the table
I have below table structure
1) users :- id ,first_name,last_name
2) users_services :- id ,user_id,service_id
3) users_speciality :- id,user_id,specility_id
4) mst_services :- id,name
5) mst_speciality :- id,name
I have used this query to get the result and it works fine.
select u.id,first_name,last_name,location,services.name as service_name,speciality.name as specility_name from users as u
inner join users_services on u.id =users_services.user_id
Inner join mst_services as services on services.id=users_services.service_id
inner join users_speciality on u.id =users_speciality.user_id
Inner join mst_speciality as speciality on speciality.id=users_speciality.service_id WHERE speciality.name ="specificity one"
as per the normalization it seems correct.But when data is more than 1,00,000 that time joining too many table causes may create problem.
what should i do for filter the user according to services and specialty ?
Have you tried like this ?
SELECT users.id,first_name,last_name, mst_services.name as service, mst_speciality.name AS speciality
FROM users
LEFT JOIN users_services ON users.id = users_services.user_id
LEFT JOIN users_speciality ON users.id = users_speciality.user_id
LEFT JOIN mst_services ON service_id = mst_services.id
LEFT JOIN mst_speciality ON speciality_id = mst_speciality.id
WHERE users.id IN
(SELECT user_id FROM users_services
WHERE service_id = (SELECT id FROM mst_services WHERE name = "service one")
UNION ALL
SELECT user_id FROM users_speciality
WHERE speciality_id = (SELECT id FROM mst_speciality WHERE name = "spercial one"))
ORDER BY first_name,last_name,service,speciality
My query is only showing a subset of records of people who have messages for me whereas I want to return a list of all users wether they have messages for me or not along with the count (or true/false, 0,1)
SELECT attendee.id, attendee.firstName, attendee.lastName, count(attendee_chat.to)
from attendee_chat
INNER JOIN attendee ON attendee.id = attendee_chat.to
INNER JOIN chat ON attendee_chat.id = chat.attendee_chat_id
WHERE attendee.id <> 1
GROUP BY attendee_chat.to;
picture is worth a thousand words.
Put the attendee table first in the FROM, and then left join to the other tables that may not have records.
SELECT attendee.id, attendee.firstName, attendee.lastName, count(attendee_chat.to)
from attendee
LEFT JOIN attendee_chat ON attendee_chat.to = attendee.id
LEFT JOIN chat ON attendee_chat.id = chat.attendee_chat_id
WHERE attendee.id <> 1
GROUP BY attendee_chat.to;
I would avoid doing a FULL OUTER JOIN as it is not necessary and may lead to some unexpected results.
EDIT: Try this. Remove the chat table as you aren't selecting from it anyway, and group on the fields from the primary table attendee, rather than the on tables that may not contain any data.
SELECT attendee.id, attendee.firstName, attendee.lastName, count(attendee_chat.to)
from attendee
LEFT JOIN attendee_chat ON attendee_chat.to = attendee.id
WHERE attendee.id <> 1
GROUP BY attendee.id, attendee.firstName, attendee.lastName;
EDIT2: After discussion of requirements that he wants a count of chats that were to him (#1)
SELECT attendee.id, attendee.firstName, attendee.lastName,
(SELECT count(1) FROM attendee_chat
WHERE attendee_chat.from = attendee.id and attendee_chat.to = 1) as chatcount
from attendee ;
EDIT3: After comment about external ID
SELECT attendee.id, attendee.firstName, attendee.lastName, attendee.attendee_id,
(SELECT count(1) FROM attendee_chat
INNER JOIN attendee a2 ON a2.id = attendee_chat.toid
WHERE attendee_chat.fromid = attendee.id and a2.attendee_id = 123
) as chatcount
FROM attendee ;
P.S. I've changed from to fromid and to -> toid as it is dangerous using reserved words as object names ;-) SQL Fiddle here
If you want to do a join on records even if they have no matching element(s) in the other relation, you probably want an OUTER JOIN instead of an INNER JOIN.
MySQL: Quick breakdown of the types of joins
Good day, I can't seem to figure out how to do this. I'll first explain my database model:
User (user_id, name)
Job (job_id, name)
UserTopJob (user_id, job_id)
UserOtherJob(user_id, job_id)
A user can setup his top jobs which he likes best. Those values will be saved into UserTopJob by the user_id and the job_id. The user can set some other jobs he likes into UserOtherJob as well.
Now, what I want to do is query out users that match my job search input.
For example, the search input is job_id 1 and 2.
Now I want to query out the users that match BOTH job_id 1 and job_id 2, but it doesn't matter whether they are in the users top or other jobs, or divided between those two tables.
So a user must be returned if:
Both job_id 1 & 2 are in top jobs
Both job_id 1 & 2 are in the other jobs
They have both job_id 1 and 2 but in different tables
The number of input ids can grow and does not have a limit. It must always match ALL input values.
Edit: So, for example if I'm putting job_ids 1 and 2 and 3 into the query, the ids 1 AND 2 AND 3 need to be in the top or other table for that user.
Can anybody please help me create a MySQL-query that can do this and doesn't put too much pressure on db-performance?
Thanks in advance for helping me out here!
You can use UNION for this type of work.
SELECT user_id AS user FROM UserTopJob where job_id in {job_ids}
UNION
SELECT user_id AS user FROM UserOtherJob where job_id in {job_ids};
Try this query:
SELECT u.*
FROM User u
WHERE NOT EXISTS (
SELECT 1
FROM User u0
JOIN Job j ON j.job_id IN (1,2) -- or other list of job ids
LEFT JOIN UserTopJob utj ON utj.user_id = u0.user_id AND utj.job_id = j.job_id
LEFT JOIN UserOtherJob uoj ON uoj.user_id = u0.user_id AND uoj.job_id = j.job_id
WHERE u0.user_id = u.user_id
AND utj.job_id IS NULL
AND uoj.job_id IS NULL
)
Test in on SQL Fiddle
You can do a JOIN between the tables to get the required result like
select u.name as user_name,
j.name as job_name
from `user` u
INNER join usertopjob utj on u.user_id = utj.user_id
inner join userotherjob uoj on u.user_id = uoj.user_id
inner join job j on j.job_id = utj.job_id or j.job_id = uoj.job_id
where j.job_id in (1,2);
Alright, this was a brain buster this evening. Toying around with this for some time I came up with this and it seems to work.
SELECT user_id, SUM(matched) AS totalMatched FROM
(
SELECT uoj.user_id, COUNT(uoj.job_id) AS matched FROM userOtherJob AS uoj
INNER JOIN user AS u ON u.user_id = uoj.user_id
WHERE uoj.job_id IN (1,2)
GROUP BY u.user_id
UNION ALL
SELECT utj.user_id, COUNT(utj.job_id) AS matched FROM userTopJob AS utj
INNER JOIN user AS u ON u.user_id = utj.user_id
WHERE utj.job_id IN (1,2)
GROUP BY u.user_id
) AS t
GROUP BY user_id
HAVING totalMatched = 2
This query counts the matches in the 'other' table, after that the matches in the 'top' table, and sums the totals of both tables. So, the total number of matches (combined from top and other) must be the same value as the number of jobs we're looking for.
I need to join tables
messages_between
users
status
I have this SQL:
SELECT messages_between.*, users.*, status.* FROM messages_between
LEFT JOIN users
ON users.uid = messages_between.user_2
LEFT JOIN status
ON status.uid = messages_between.user_2
WHERE messages_between.user_1 = 123
So this query works fine but the problem is when I don't have a row in messages_between.
The uid is code which is used in columns user_1 or user_2
Any suggestions?
Thanks
[EDIT]
My structures of tables:
users has columns: id, name, password, password_s, uid
status has columns: id, uid, status[if he/she is online or offline]
messages_between has columns: id, user_1, user_2, mid
So I want to show users.name, status.status, messages_between.user_2, messages_between.mid
Is this what you want?
SELECT messages_between.*, users.*, status.*
FROM users LEFT JOIN
messages_between
ON users.uid = messages_between.user_2 and messages_between.user_1 = 123 LEFT JOIN
status
ON status.uid = users.uid;
This keeps all users, providing additional information when there is an appropriate "message between".
You can try the following query. When you need null from the joined tables then you should not add the conditiona in where clause. Either you also check with null or add the conditiona in join clause.
Also you need to change the order of left join, becuase you want to retrive all the recrods from the users table and null values for the missing messages_between records and status records.
SELECT messages_between.*, users.*, status.* FROM messages_between
LEFT JOIN users
ON users.uid = messages_between.user_2 AND messages_between.user_1 = 123
LEFT JOIN status
ON status.uid = messages_between.user_2
I have a database that contains messages. The messages are stored in one table, the user information is stored in another. In the message table, there is an author_id column which represents the user_id of the author from the user table, there are all the message columns, and there is a to_address which represents a concatenation of "u_" + user_id from the user table. Is there any that I can join these two tables, so that it display the username instead of ID in BOTH the author_id AND to_address.
I've tried
SELECT username, ..., username
FROM msgs
INNER JOIN users
ON user_id=author_id AND concat("u_",user_id)=to_address;
with obvious error
I've tried using subqueries such as
SELECT
( SELECT username
FROM users
INNER JOIN msgs
ON user_id=author_id
) AS "From",
( SELECT username
FROM users
INNER JOIN msgs
ON CONCAT("u_",user_id)=to_address
) AS "To",
( SELECT timestamp(message_time) FROM msgs
) AS "Sent",
( SELECT message_subject FROM msgs
) AS "Subject",
( SELECT message_text AS "Message" FROM msgs
) AS "Message"
and got "Subquery returns more than 1 row". Is there any way that I can do this successfully?
It sounds like you want something like this:
SELECT
from_user.username AS "From",
to_user.username AS "To",
timestamp(msgs.message_time) AS "Sent",
msgs.message_subject AS "Subject",
msgs.message_text AS "Message"
FROM msgs
INNER JOIN users AS from_user
ON msgs.author_id = from_user.user_id
INNER JOIN users AS to_user
ON msgs.to_address = CONCAT("u_", to_user.user_id);
Basically, you join the users table to the msgs table twice, giving each instance of the table a different name and a different join condition. Then you can pick a specific column out of a specific instance of the users table.
I think you want to do something like
SELECT msgs.*,
authors.whatever,
addresses.to_address
FROM msgs
JOIN users AS authors ON msgs.author_id = authors.id
JOIN users AS addresses ON msgs.address_id = addresses.id
My query is perhaps imprecise but you can probably see what I'm doing here.
As an aside, I would recommend not abbreviating msgs and using singular table names.
You need two joins as you want to get two separate users:
select f.username, t.username
from msgs m
inner join users f on f.user_id = m.author_id
inner join users t on concat("u_", t.user_id) = m.to_address
This will return the username associated with both the "author_id" and the "to_address", using correlated subqueries, instead of using JOIN. (Using a JOIN is the usual approach, but an approach using a correlated subquery gives you some additional flexibility.
SELECT (SELECT u.username
FROM users u
ON u.user_id = CONCAT("u_",u.user_id) = m.to_address
ORDER BY u.username LIMIT 1
) AS to_username
, (SELECT a.username
FROM users a
ON a.user_id = m.author_id
ORDER BY a.username LIMIT 1
) AS author_username
, m.*
FROM msgs m
NOTE: this differs a bit from an INNER JOIN in that this will return a row from msg when a matching username is not found for the to_address or the author_id.)
NOTE: this assumes that user_id is unique in the users table.
NOTE: if the username column is NOT NULL in the users table, then you can emulate the INNER JOIN, and NOT return a row if a matching username is not found for the author_id or to_address by adding
HAVING to_username IS NOT NULL
AND author_username IS NOT NULL