在一個查詢中選擇多對多表

Question

我有桌子：

**RUBRIC:** `RubricID, RubricName`

**AUTOR:** `AutorID, FirstName, LastName`

**BOOK:** `BookID, BookName, book_photo`

**BOOKAUTOR:** `BookID, AutorID`

**BOOKRUBRIC:** `BookID, RubricID`

我想寫一個返回BookName，FirstName，LastName，RubricName的SELECT查詢。

我有兩個單獨的查詢，但我不知道如何在一次選擇中編寫此查詢。 這就是我得到的：

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;

它工作正常，但如何在一個選擇中寫？

我嘗試這樣做，但不起作用：

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;

它返回錯誤：

ERROR 1054 (42S22): Unknown column 'bookautor.BookID' in 'on clause'

Answer 1

試試這個查詢

SELECT book.BookName, autor.FirstName, autor.LastName, rubric.RubricName 
FROM bookautor
JOIN book ON book.BookID=bookautor.BookID 
JOIN autor on autor.AutorID=bookautor.AutorID 
left join bookrubric on book.BookID=bookrubric.BookID
LEFT JOIN rubric ON rubric.RubricID=bookrubric.RubricID;