Retrieving Records from Multiple Tables in MySQL - mysql

Question

How to select records from multiple table
Table "users":
user_id|username|email|login|password
Table "users_log"
log_id|user_id|status|timestamp|message
Table "users_balance"
balance_id|user_id|status|amount
Table "users_roles"
role_id|status|role_name
Table "users_role"
role_id|user_id
how to retrieving all records by user email and log status and user role
Output:
log-timestamp|user_id|Username|email|role_name|balance-amount|log-message

Answer 1

Something like this I'm guessing.
SELECT
log.timestamp AS log_timestamp,
u.user_id,
u.username AS user_name,
u.email AS user_email,
role.name AS role_name,
bal.amount AS balance_amount,
log.message AS log_message
FROM users AS u
JOIN users_role AS ur ON ur.user_id = u.user_id
JOIN users_roles AS role ON role.role_id = ur.role_id
JOIN users_log AS log ON u.user_id = log.user_id
LEFT JOIN users_balance AS bal ON bal.user_id = u.user_id
WHERE u.email = #UserEmail
AND role.role_name = #RoleName
AND log.status = #LogStatus
And then set or replace the #UserEmail, #RoleName, #LogStatus variables by what you're looking for.
But depending on the data you might want to add a GROUP BY and an aggregate function like MAX or SUM, and perhaps extra criteria in the WHERE or HAVING clause.

Answer 2

You can use JOIN query to get data from multiple tables
Please try this,
SELECT usr.*,usrlg.*,usrbl.*,usrrl.*,usrrls.* FROM users AS usr JOIN users_log AS usrlg ON(usrlg.user_id=usr.user_id) JOIN users_balance AS usrbl ON (usrbl.user_id=usr.user_id)
JOIN users_role AS usrrl ON(usrrl.user_id=usr.user_id) JOIN users_roles AS usrrls ON(usrrls.role_id=usrrl.role_id)
WHERE usr.email='value' AND usrlg.status='value' AND usrrls.role_name='value'

Answer 3

You can do it through joins. Can refer below links.
https://www.guru99.com/joins.html
http://www.mysqltutorial.org/mysql-join/
https://www.tutorialspoint.com/mysql/mysql-using-joins.htm