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-- schema
CREATE TABLE tblAdmVenue (
venueID VARCHAR(225) NOT NULL,
venueName VARCHAR(225) NOT NULL,
PRIMARY KEY(venueID)
);
CREATE TABLE tblAdmVenueLink (
venueLinkID VARCHAR(225) NOT NULL,
mainVenueID VARCHAR(225) NOT NULL,
subVenueID VARCHAR(225) NOT NULL,
PRIMARY KEY(venueLinkID)
-- FOREIGN KEY (DepartmentId) REFERENCES Departments(Id)
);
-- data
INSERT INTO tblAdmVenue (venueID, venueName)
VALUES ('LA43', 'Big Room'), ('LA44', 'Hall'),
('LA45', 'Room Daisy'), ('LA46', 'Room Rose'),
('LA47', 'Banquet'), ('LA48', 'Split 1'),
('LA49', 'Meeting Room WP');
INSERT INTO tblAdmVenueLink (venueLinkID, mainVenueID, subVenueID)
VALUES ('1', 'LA43', 'LA45'), ('2', 'LA43', 'LA46'),
('3', 'LA46', 'LA48'), ('4', 'LA44', 'LA49');
Records: 7 Duplicates: 0 Warnings: 0
Records: 4 Duplicates: 0 Warnings: 0
with recursive cte (subVenueID, mainVenueID,level) as (
select subVenueID,
mainVenueID, 1 as level
from tblAdmVenueLink
union
select p.subVenueID,
cte.mainVenueID,
cte.level+1
from tblAdmVenueLink p
inner join cte
on p.mainVenueID = cte.subVenueID
)
select
CONCAT(GROUP_CONCAT(b.venueName ORDER BY level DESC SEPARATOR '-->') ,'-->',a.venueName)
from cte c
LEFT JOIN tblAdmVenue a ON a.venueID = c.subVenueID
LEFT JOIN tblAdmVenue b ON b.venueID = c.mainVenueID
GROUP BY subVenueID;
| CONCAT(GROUP_CONCAT(b.venueName ORDER BY level DESC SEPARATOR '-->') ,'-->',a.venueName) |
|---|
| Big Room-->Room Daisy |
| Big Room-->Room Rose |
| Big Room-->Room Rose-->Split 1 |
| Hall-->Meeting Room WP |