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我有表:選擇多對多表在一個查詢
**RUBRIC:** `RubricID, RubricName`
**AUTOR:** `AutorID, FirstName, LastName`
**BOOK:** `BookID, BookName, book_photo`
**BOOKAUTOR:** `BookID, AutorID`
**BOOKRUBRIC:** `BookID, RubricID`
我想在返回BOOKNAME,名字,姓氏,RubricName一個SELECT查詢語句來寫。
我有兩個單獨的查詢,但我不知道如何寫在一個選擇。 這是我的了:
SELECT book.BookName, autor.FirstName, autor.LastName FROM bookautor JOIN book ON book.BookID=bookautor.BookID JOIN autor on autor.AutorID=bookautor.AutorID;
SELECT rubric.RubricName FROM bookrubric JOIN rubric ON rubric.RubricID=bookrubric.RubricID;
它的工作不錯,但如何在一個寫選擇?
我嘗試這一點,但它不工作:
SELECT book.BookName, autor.FirstName, autor.LastName, rubric.RubricName FROM bookautor,bookrubric JOIN book ON book.BookID=bookautor.BookID JOIN autor on autor.AutorID=bookautor.AutorID LEFT JOIN rubric ON rubric.RubricID=bookrubric.RubricID;
它會返回錯誤:
ERROR 1054 (42S22): Unknown column 'bookautor.BookID' in 'on clause'
它的作品,謝謝你,但你可以請如果你能解釋爲什麼'從bookautor'和爲什麼LEFT JOIN? – Nevada