Union two SELECT queries in one - mysql

Question

as i can't brain this out I'm asking for your help. I'm not so familiar with UNIONS. I have two SELECT queries which i would like to merge in one.
So i want to select the name based on userId from table Teams and their gameAcc from table connections based on teamsId.
I've made two separate queries:
SELECT users.name
FROM users
JOIN teams
ON users.id = teams.usersId
WHERE teams.Id = 1
SELECT connections.gameAcc
FROM connections
JOIN users
ON connections.usersId = users.id
JOIN teams
ON connections.teamsId = teams.id
WHERE teams.id = 1
Expected: A single query that will output 1 row with users name from teams table and their gameAcc from connections table.
Example data:
And i want it to output:
|John| | JohnKiller |
Thanks for your help!

Answer 1

You need to join the 3 tables and not UNION:
SELECT users.name, connections.gameAcc
FROM users
INNER JOIN teams ON users.id = teams.usersId
INNER JOIN connections ON connections.teamsId = teams.id
WHERE teams.Id = 1
I used INNER joins just like your code.
Depending on the case maybe you need LEFT joins if there is no WHERE clause.
Edit, after the questions updates.
SELECT u.name, c.gameAcc
FROM connections c
JOIN users u ON c.usersId = u.id
JOIN teams t1 ON c.teamsId = t1.id
JOIN teams t2 ON u.id = t2.usersId
WHERE t2.id = 1;

Answer 2

EDIT:
From the comments above, you seem to want the name of the owner, and the gameAcc.
In my example below, I changed teams.usersId to "ownerId", to avoid confusion.
I'm assuming that the connections table is joined to the users table, and also to the teams table.
https://www.tutorialspoint.com/execute_sql_online.php
BEGIN TRANSACTION;
/* Create tables for example: */
CREATE TABLE USERS(Id integer PRIMARY KEY, Name text);
CREATE TABLE TEAMS(Id integer PRIMARY KEY, Name text, ownerId integer);
CREATE TABLE CONNECTIONS(Id integer PRIMARY KEY, usersId integer, teamsId integer, gameAcc text);
/* Create new records in these tables */
INSERT INTO USERS VALUES(1,'Jim');
INSERT INTO USERS VALUES(2,'Paul');
INSERT INTO USERS VALUES(3,'Tony');
INSERT INTO USERS VALUES(4,'Bill');
INSERT INTO USERS VALUES(5,'Art');
INSERT INTO TEAMS VALUES(11,'Tigers', 1); -- owner = user.id = 1
INSERT INTO TEAMS VALUES(22,'Raptors', 2); -- owner = user.id = 2
INSERT INTO CONNECTIONS VALUES(111, 1, 11, 'gameAcc1');
INSERT INTO CONNECTIONS VALUES(222, 2, 22, 'gameAcc2');
INSERT INTO CONNECTIONS VALUES(333, 3, 22, 'gameAcc2');
INSERT INTO CONNECTIONS VALUES(444, 4, 22, 'gameAcc2');
INSERT INTO CONNECTIONS VALUES(555, 5, 11, 'gameAcc2');
COMMIT;
/* Display desired records from the tables */
SELECT users.name, connections.gameAcc
FROM users
JOIN connections ON connections.usersId = users.id
JOIN teams ON connections.teamsId = teams.id
WHERE teams.id = 11 AND teams.ownerId = users.id

Answer 3

Split it on steps.
First you want to know the owner
SELECT t.userid
FROM teams t
WHERE t.teamid = 1
Now you want the owner name
SELECT t.userid, u.name
FROM teams t
JOIN users u
ON t.userid = u.id
WHERE t.teamid = 1
Now you want the game acc for the owner
SELECT t.userid, u.name, c.gameAcc
FROM teams t
JOIN users u
ON t.userid = u.id
JOIN connection c
ON t.userid = c.userid
WHERE t.teamid = 1