"self join" Code Answer's
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what is self join
Obedient Ocelot
on Jan 07, 2021
Self is joining a table to itself.
-- assume employee table as 2 different table using different alias
-- as manager and worker
-- we want to join these 2 virtual manager and worker table
-- to get manager's first name and worker's first name
-- our condition is worker's manager_id match managers employee id
SELECT manager.FIRST_NAME AS MANAGER_NAME ,
worker.FIRST_NAME AS WORKER_NAME
FROM EMPLOYEES manager
INNER JOIN EMPLOYEES worker on worker.MANAGER_ID = manager.EMPLOYEE_ID
order by 1
;self join example
Brave Bee
on Jun 05, 2020
SELECT
e.first_name + ' ' + e.last_name employee,
m.first_name + ' ' + m.last_name manager
FROM
sales.staffs e
INNER JOIN sales.staffs m ON m.staff_id = e.manager_id
ORDER BY
manager;self join
Super Stoat
on Oct 05, 2020
SELECT column_name(s)
FROM table1 T1, table1 T2
WHERE condition;All those coders who are working on the Whatever based application and are stuck on self join can get a collection of related answers to their query. Programmers need to enter their query on self join related to Whatever code and they'll get their ambiguities clear immediately. On our webpage, there are tutorials about self join for the programmers working on Whatever code while coding their module. Coders are also allowed to rectify already present answers of self join while working on the Whatever language code. Developers can add up suggestions if they deem fit any other answer relating to "self join". Visit this developer's friendly online web community, CodeProZone, and get your queries like self join resolved professionally and stay updated to the latest Whatever updates.
