smallkun/class-notes
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smallkun 2025-02-27 17:41:29 +08:00
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commit 621b846797
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2208/天天乐学考试答案/MySQL练习（一）.md
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@ -249,7 +249,7 @@ SELECT b.genre, a.author_name, COUNT(*) c
FROM tb_books b, tb_authors a FROM tb_books b, tb_authors a
WHERE b.note = a.author_name WHERE b.note = a.author_name
GROUP BY b.genre, a.author_id 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(*) SELECT COUNT(*)
FROM tb_books FROM tb_books
WHERE b.genre = genre WHERE b.genre = genre