"HR-SQL Binary Tree Nodes"의 두 판 사이의 차이

2021년 7월 31일 (토) 10:49 기준 최신판

1 개요[ | ]

HR-SQL Binary Tree Nodes

해커랭크 SQL
문제	DB2	MS SQL	MySQL	Oracle
HR-SQL Advanced Select e
HR-SQL Type of Triangle
HR-SQL The PADS
HR-SQL Occupations
HR-SQL Binary Tree Nodes
HR-SQL New Companies

2 DB2[ | ]

3 MS SQL[ | ]

4 MySQL[ | ]

SELECT N, CASE
    WHEN P IS NULL THEN 'Root' 
    WHEN (SELECT COUNT(*) FROM BST WHERE P=A.N) = 0 THEN 'Leaf'
    ELSE 'Inner'
END
FROM BST A
ORDER BY N;

SELECT N, CASE
    WHEN P IS NULL THEN 'Root' 
    WHEN (SELECT COUNT(*) FROM BST WHERE P=A.N) > 0 THEN 'Inner'
    ELSE 'Leaf'
END
FROM BST A
ORDER BY N;

5 Oracle[ | ]

@@ 7번째 줄: / 7번째 줄: @@
 |}
-<source lang='sql'>
+==DB2==
-</source>
+<syntaxhighlight lang='sql'>
+</syntaxhighlight>
+==MS SQL==
+<syntaxhighlight lang='sql'>
+</syntaxhighlight>
+==MySQL==
+<syntaxhighlight lang='mysql'>
+SELECT N, CASE
+    WHEN P IS NULL THEN 'Root'
+    WHEN (SELECT COUNT(*) FROM BST WHERE P=A.N) = 0 THEN 'Leaf'
+    ELSE 'Inner'
+END
+FROM BST A
+ORDER BY N;
+</syntaxhighlight>
+<syntaxhighlight lang='mysql'>
+SELECT N, CASE
+    WHEN P IS NULL THEN 'Root'
+    WHEN (SELECT COUNT(*) FROM BST WHERE P=A.N) > 0 THEN 'Inner'
+    ELSE 'Leaf'
+END
+FROM BST A
+ORDER BY N;
+</syntaxhighlight>
+==Oracle==
+<syntaxhighlight lang='sql'>
+</syntaxhighlight>