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2025-02-27 17:41:29 +08:00 · 2025-02-27 17:41:29 +08:00 · 621b846797
commit 621b846797
parent 522e2388ca
1 changed files with 1 additions and 1 deletions
--- 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
@ -249,7 +249,7 @@ 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(*) = (
+HAVING COUNT(*) = ( #子查询用来统计这个类别中 数量最多的作者的图书数量
 	SELECT COUNT(*)
 	FROM tb_books
 	WHERE b.genre = genre