sql - 在 JDBC 中连接三个表

Question

我有这段代码，但不断出现语法错误。

query = "SELECT * "+
"FROM Product " +
"INNER JOIN Orders ON (Product.ItemID=Orders.ItemID) " +
"LEFT OUTER JOIN SupplierProduct ON (Orders.ItemID=SupplierProduct.ItemID) "+
"WHERE Product.Receiver = 'Fred' " +
"ORDER BY Product.ItemName";    

DefaultTableModel data = table.getQuery(query);

我还尝试了 INNER JOIN 来代替 LEFT OUTER JOIN。我不断尝试的错误是。

java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver] Syntax error (missing     operator) in query expression '(Product.ItemID=Orders.ItemID) LEFT OUTER JOIN  SupplierProduct ON (Orders.ItemID=SupplierProduct.ItemID'.
at sun.jdbc.odbc.JdbcOdbc.createSQLException(Unknown Source)
at sun.jdbc.odbc.JdbcOdbc.standardError(Unknown Source)
at sun.jdbc.odbc.JdbcOdbc.SQLExecDirect(Unknown Source)
at sun.jdbc.odbc.JdbcOdbcStatement.execute(Unknown Source)

我在这里缺少什么或者如何加入三个表。

Answer 1

尝试像这样使用括号:

query = "SELECT * "+
        "FROM (Product " +
        "INNER JOIN Orders ON (Product.ItemID=Orders.ItemID)) " +
        "LEFT OUTER JOIN SupplierProduct ON (Orders.ItemID=SupplierProduct.ItemID) "+
        "WHERE Product.Reciever = 'Fred' " +
        "ORDER BY Product.ItemName";