mysql query - how do I need to split the table data

Question

Thanks in advance.

I have a table, called person_details. Here's the sample dat of person_details table.

ID    Name_and_Dept         Location
-------------------------------------
1     John Doe - Finance    New York
2     Emmy Joe - IT         Boston
3     Stella Job - Admin    Chicago
4     Steve Doe - Finance   Los Angeles
5     Frank Chad - Sales    Boston
6     Rich Moss - Admin     New York

I have two new tables called person_dept and person_location. I need the person_details table data in both person_dept and person_location tables in following way.

table 表

P_ID  Name          Dept
---------------------------
1     John Doe      Finance
2     Emmy Joe      IT
3     Stella Job    Admin
4     Steve Doe     Finance
5     Frank Chad    Sales
6     Rich Moss     Admin

person_location table

L_ID  Name          Location
---------------------------
1     John Doe      New York
2     Emmy Joe      Boston
3     Stella Job    Chicago
4     Steve Doe     Los Angeles
5     Frank Chad    Boston
6     Rich Moss     New York

Not sure if I can achieve this using a query or stored proc or a trigger. I really appreciate if someone could please help. Thanks, again.

Answer 1

You are looking for SUBSTRING_INDEX function. If you want your tables strutcured as in your question, you could use two INSERT queries like these ones instead of a trigger:

INSERT INTO person_dept
SELECT
  ID,
  SUBSTRING_INDEX(Name_and_Dept, ' - ', 1),
  SUBSTRING_INDEX(Name_and_Dept, ' - ', -1)
FROM person_details;

INSERT INTO person_location
SELECT
  ID,
  SUBSTRING_INDEX(Name_and_Dept, ' - ', 1),
  Location
FROM person_details;

Please see fiddle here . If you need the record to be automatically into person_dept and person_location table, you need a trigger, and you could start with something like this:

DELIMITER |
CREATE TRIGGER populate_tables AFTER
INSERT ON person_details
BEGIN
  INSERT INTO person_dept VALUES
    (new.ID,
     SUBSTRING_INDEX(new.Name_and_Dept, ' - ', 1),
     SUBSTRING_INDEX(new.Name_and_Dept, ' - ', -1)
     );
  INSERT INTO person_location
  VALUES
    (new.ID,
    SUBSTRING_INDEX(new.Name_and_Dept, ' - ', 1),
    new.Location
    );
END;
|
DELIMITER ;