两个表上的SQL连接语句

Question

我在两个表Product_Number和Manufacturer上创建了两个表Product_Tree和Product之间的连接，以返回匹配的列。

以下是2个表格：

表：Product_Tree

Col1,Col2,Model_Number,Col3,Manufacturer,Col4
111111,Pepsi,aaa,111111,aaa,description
222222,Miranda,bbb,222222,bbb,'description
333333,Cola,bbb,333333,bbb,description

表：产品

Model_Number,Manufacturer
a,a
b,b
c,c
d,d

以下是查询：

SELECT Product_Tree.col0,Product_Tree.col1,Product_Tree.col2,Product_Tree.col3,Product_Tree.Model_Number,Product_Tree.Manufacturer 
FROM Product_Tree 
JOIN Product ON Product.model_number LIKE ''''%''''Product_Tree.MODEL_NUMBER''''%'''' 
AND Product.manufacturer LIKE ''''%''Product_Tree.MANUFACTURER''''%'''';

我收到此错误：

ORA-00911: invalid character

Answer 1

您需要使用连接运算符将%通配符连接到列product_tree.manufacturer：

SELECT Product_Tree.col0,Product_Tree.col1,Product_Tree.col2,Product_Tree.col3,Product_Tree.Model_Number,Product_Tree.Manufacturer 
FROM Product_Tree 
JOIN Product ON Product.model_number LIKE '%' || Product_Tree.MODEL_NUMBER || '%' 
AND Product.manufacturer LIKE '%' || Product_Tree.MANUFACTURER || '%';

我猜这个查询是在一个脚本中，并使用单引号'引用，这就是为什么你在这里有单引号的原因。如果是这种情况，那么引用的SQL语句将是：

SELECT Product_Tree.col0,Product_Tree.col1,Product_Tree.col2,Product_Tree.col3,Product_Tree.Model_Number,Product_Tree.Manufacturer 
FROM Product_Tree 
JOIN Product ON Product.model_number LIKE ''%'' || Product_Tree.MODEL_NUMBER || ''%'' 
AND Product.manufacturer LIKE ''%'' || Product_Tree.MANUFACTURER || ''%'';