From 522e2388ca4a5f2b4f4aad3238c97ec5e456e530 Mon Sep 17 00:00:00 2001
From: smallkun <smallerkun@foxmail.com>
Date: Thu, 27 Feb 2025 17:40:50 +0800
Subject: [PATCH] Auto commit

---
 2208/天天乐学考试答案/MySQL练习（一）.md | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/2208/天天乐学考试答案/MySQL练习（一）.md b/2208/天天乐学考试答案/MySQL练习（一）.md
index 5196944..090fa27 100644
--- a/2208/天天乐学考试答案/MySQL练习（一）.md
+++ b/2208/天天乐学考试答案/MySQL练习（一）.md
@@ -243,7 +243,21 @@ WHERE b.note = a.author_name
 GROUP BY a.author_id
 HAVING COUNT(*) > 1;
 
+#9 视图
+CREATE VIEW v_book AS
+SELECT b.genre, a.author_name, COUNT(*) c
+FROM tb_books b, tb_authors a
+WHERE b.note = a.author_name
+GROUP BY b.genre, a.author_id 
+HAVING COUNT(*) = (
+	SELECT COUNT(*)
+	FROM tb_books
+	WHERE b.genre = genre
+	GROUP BY note
+	ORDER BY COUNT(*) DESC
+	LIMIT 1
+);
+
 
-#9
 ```