I'm unable to form a query with the following tables, which will find out all the Notes from Note table, which is created by any user, who belongs to the logged in user's same company.
Note:
note_id (int),
note_text (varchar),
created_by (int)
User:
user_id (int),
company_id (int)
Logged in user's user id is passed as parameter to the query.
I want to pick up notes from the table Notes where created_by in (user_id of all users whose company_id = company_id of LOGGED_IN_USER)
Please help me to formulate out the query. Looks pretty straight forward, but just can't reach to it's end.
I'm not sure if LOGGED_IN_USER is a table or another object, but if it is a table with the columns you referenced, a join like this would work.
select note_text
from Note n
JOIN User u ON u.user_id = n.created_by
JOIN LOGGED_IN_USER lin ON lin.user_id = u.user_id
and lin.company_id = u.company_id
u might need a Foreign Key for user_id to Notes. and use INNER JOIN
Thanks Vinnie and all for your responses. I finally succeeded to figure out the query. LOGGED_IN_USER_ID is just a numeric parameter which should be passed to the query.
select n.* from Note n where
n.created_by in (
select u1.user_id from User u1 inner join User u2
on u1.company_id=u2.company_id and u2.user_id = :LOGGED_IN_USER_ID*
)
Thanks again.
If i am not misunderstood your question,Try this way
SELECT note_text
FROM Note n
INNER JOIN User u ON u.user_id = n.created_by
WHERE n.created_by= (select u.user_id from User where company_id=LOGGED_IN_USER LIMIT 1 )
Related
User
USER_ID USERNAME
1 -
2 Chris
3 Dave
4 Vlad
Issue
Creator RESOLVER VERIFIER
2 3 4
2 3 1
3 1 1
expected output:
Creator RESOLVER VERIFIER
Chris Dave Vlad
Chris Dave -
Dave - -
current code I have:
SELECT creatorid.username, resolverid.username, verifierid.username
FROM issue
JOIN user creatorid ON issue.creator = creatorid.user_id
JOIN user resolverid ON issue.resolver = resolverid.user_id
JOIN user verifierid ON issue.verifier = verifierid.user_id
do i have to join the table 3 times to get the corresponding username of the user_id in issue table or is there is a simpler way of doing this? Asking as this is a simplified version of the tables, the User and Issue table contains a lot of other columns. Thanks
Because of the join, you will see each issue three times which is not what you want. You could use three scalar subqueries to get around that:
select i.id,
(select username from users u1 where u1.user_id = i.creator) as creator,
(select username from users u2 where u2.user_id = i.resolver) as resolver,
(select username from users u3 where u3.user_id = i.verifier) as verifier
from issue i;
This isn't going to be fast though.
Another option is to aggregate all user_id / username pairs into a JSON object, then use that in a sub-query:
select i.id, -- other columns from the issue table
u.names ->> i.creator::text as creator,
u.names ->> i.resolver::text as resolver,
u.names ->> i.verifier::text as verifier
from issue i
join lateral (
select jsonb_object_agg(user_id, username) as names
from users u
where u.user_id in (i.creator, i.resolver, i.verifier)
) u on true;
The traditional way to do this is:
select i.*, uc.username, ur.username, uv.username
from issue i left join
users uc
on uc.user_id = i.creator left join
users ur
on ur.user_id = i.resolver left join
users uv
on uv.user_id = i.verifier;
I have two tables Task and User
Task PRIMARY KEY
IdTask
TaskName
IdHandler FOREIGN KEY REFERENCES IdUser
IdCreator FOREIGN KEY REFERENCES IdUser
User
IdUser PRIMARY KEY
Name
How to query with IdHandler and IdCreator reference to IdUser
Expected Result: TaskName, Name(Handler), Name(Creator)
PS: I'm also do not know if I can put Foreign Keys like that, at least SQL Server let me do it.
SELECT TaskName, h.Name [HandlerName], c.Name [CreatorName]
FROM Task t
INNER JOIN User h ON t.IdHandler = h.IdUser
INNER JOIN User c ON t.IdCreator = c.IdUser
Please see below query.
Select
tt.TaskName,
userHandler.Name as 'UserHandler',
userCreator.Name as 'UserCreator'
from
TasKTable tt
left join
User userHandler on userHandler.IdUser = tt.IdHandler
left join
User userCreator on userCreator.IdCreator = tt.IdHandler
select all field from all table
Select
tt.*,
userHandler.*,
userCreator.*
from
TasKTable tt left join
User userHandler on userHandler.IdUser = tt.IdHandler left join
User userCreator on userCreator .IdCreator = tt.IdHandler
You may also check this SQL Tutorial for reference.
Here is an alternative query not using JOINs
select T.NAME_TASK
,(select U1.NAME from USERS U1 where U1.ID_USER = T.ID_HANDLER) as HANDLER
,(select U2.NAME from USERS U2 where U2.ID_USER = T.ID_CREATOR) as CREATOR
from TASKS T
Refer to this db<>fiddle
I have tables users and topics. Every user can have from 0 to several topics (one-to-many relationship).
How I can get only those users which have at least one topic?
I need all columns from users (without columns from topics) and without duplicates in table users. In last column I need number of topics.
UPDATED:
Should be like this:
SELECT user.*, count(topic.id)
FROM ad
LEFT JOIN topic ON user.id = topic.ad
GROUP BY user.id
HAVING count(topic.id) > 0;
but it takes 0 result. But it should not be 0.
Firstly you need to have your two tables, because you have left limited information about your table structure I will use an example to explain how this works, you should then be able to easily apply this to your own tables.
Firstly you need to have two tables (which you do)
Table "user"
id | name
1 | Joe Bloggs
2 | Eddy Ready
Table "topic"
topicid | userid | topic
1 | 1 | Breakfast
2 | 1 | Lunch
3 | 1 | Dinner
Now asking for a count against each user is done using the follwing;
SELECT user.name, count(topic.topicid)
FROM user
INNER JOIN topic ON user.id = topic.userid
GROUP BY user.name
If you use a left join, this will include records from the "user" table which does not have any rows in the "topic" table, however if you use an INNER JOIN this will ONLY include users who have a matching value in both tables.
I.e. because the user id "2" (which we use to join) is not listed in the topic table you will not get any results for this user.
Hope that helps!
use inner join and distinct
select distinct user_table.id
from user_table
inner join topics_table on topic_table.user_id = user_table.id
select u.id
, u.name
, count(b.topicName)
from user u
left join topic t on t.userid = u.id
group by u.id, u.name
You can select topic number per user and then join it with user data. Something like this:
with t as
(
select userid, count(*) as n
from topic
group by userid
)
SELECT user.*, t.n
FROM user
JOIN t ON user.id = t.userid
I have 3 tables (user, relationship and user_type) with these data (the relevant ones):
USER TABLE:
id, username, avatar, user_type_id
RELATIONSHIP TABLE:
id, user_id1, user_id2, relationship_points
USER_TYPE
id
I'm trying to create a single entry per relationship so, user with id "1" could be in user_id1 OR user_id2 in a relationship, so, I don't have to duplicate unnecessary data.
I already created (thanks to another StackOverflow answer) a query to select all relationship details from an user, but only if it's id is in "user_id1".
SELECT
r.id AS relationship_id,
r.relationship_points AS points,
u.username AS username,
u.avatar_url AS avatar
FROM
relationship AS r
INNER JOIN
user AS u
ON
r.user_id2 = u.id
INNER JOIN
user_type AS t
ON
u.user_type_id = t.id
WHERE
r.user_id1 = ?
But, as you can see, if the user is in "user_id2", it doesn't work.
I know I could make another query, but I think it's the "easy, lazy" way, and I would love to learn how to do this in a single query.
Let me know if this makes the trick:
SELECT
r.id AS relationship_id,
r.relationship_points AS points,
u.username AS username,
u.avatar_url AS avatar
FROM relationship AS r
INNER JOIN user u
ON r.user_id2 = u.id OR r.user_id1 = u.id
INNER JOIN user_type AS t
ON u.user_type_id = t.id
WHERE u.id = ?
Ok so I have a table for notes in my database and a table for users in my database. Lets say notes table looks like this:
NoteId NoteTitle NoteAuth
--------------------------------
1 TempTitle 254
2 TempTitle2 871
and Users table looks like:
UserId UserName
-------------------
254 Bob
871 Jim
How can I select from the Note table but select the NoteAuth as the UserName from the Users table. Basically how can I use a primary key without a primary key being set up on the table.
SELECT NoteID, NoteTitle, UserName
FROM Notes INNER JOIN Users ON Notes.NoteAuth = Users.UserID
There's no requirement for any keys to exist to use a column in a JOIN.
You can try something like this
SELECT Notes.NoteId, Notes.NoteTitle, Notes.NoteAuth
FROM Notes
INNER JOIN Users ON Notes.NoteAuth = Users.UserId
WHERE Users.UserName = 'Bob'
Edit
Here is a version that returns the user name for a specified note author.
SELECT Users.UserName, Notes.NoteId, Notes.NoteTitle, Notes.NoteAuth
FROM Notes
INNER JOIN Users ON Notes.NoteAuth = Users.UserId
WHERE Notes.NoteAuth = 254
select n.NoteId, n.NoteTitle, n.NoteAuth, u.UserName
from Notes n
inner join User u on n.NoteAuth = u.UserID
The lack of a primary key will cause lack of table integrity. Now you won't be able to create a foreign key between the tables. This means that going forward you will be allowed to create a note with a user that doesn't exist in the Users table.
This won't stop you from
SELECT n.NoteTitle, u.UserName
FROM NoteTable n LEFT JOIN Users u ON n.NoteAuth = u.UserId
That will work in SqlServer.
The problem is is if you have a note that has a NoteAuth that doesn't exist in the users table, you'll end up with a NULL username. Use an ISNULL to replace NULL with something like 'No Username'.
But like I said, there won't be any integrity between the tables.
SELECT U.Username, N.NoteTitle from Notes N, Users U WHERE N.NoteAuth = U.UserId