Code Tippen · SQL
Recursive CTE
Walk a category tree from the root down.
Schwierigkeit: Fortgeschritten · 11 Zeilen · Lizenz: public-domain
WITH RECURSIVE category_tree AS (
SELECT id, name, parent_id, 0 AS depth
FROM categories
WHERE parent_id IS NULL
UNION ALL
SELECT c.id, c.name, c.parent_id, t.depth + 1
FROM categories AS c
INNER JOIN category_tree AS t
ON c.parent_id = t.id
Zeit0:00
Tempo (WPM)0.0
Genauigkeit100.0%
Fehler0
Live Tastatur
Nächste Taste: W | Letzter Anschlag: -
Fortschritt: 0.0%
"
1
2
3
4
5
6
7
8
9
0
*
-
=
F
G
Ğ
I
O
D
R
N
H
P
Q
W
'
U
İ
E
A
Ü
T
K
M
L
Y
Ş
X
J
Ö
V
C
Ç
Z
S
B
.
,
;
/
Leerzeichen
Timed Test Leaderboard
Noch kein Ergebnis vorhanden.