如何在mySQL

Question

我们说我有桌子

产品

model   speed  type
1001    1      pc
1002    2      pc
1003    1      pc
2001    null   laptop
2002    null   laptop

笔记本

model   speed  screen
2001    1      12
2002    2      13

我想要表

model   speed  screen type
1001    1      null   pc
1002    2      null   pc
1003    1      null   pc
2001    1      12     laptop
2002    2      13     laptop

我的尝试

SELECT
    product.model
FROM Laptop LEFT JOIN product
ON (product.model = laptop.model)
UNION
SELECT
    product.model
FROM Laptop RIGHT JOIN product
ON (product.model = laptop.model)

我会得到＆＃34;速度不明确＆＃34;错误。怎么解决？

Answer 1

尝试此查询

SELECT
    product.model, laptop.speed
FROM Laptop LEFT JOIN product
ON (product.model = laptop.model)
UNION
SELECT
    product.model, product.speed
FROM Laptop RIGHT JOIN product
ON (product.model = laptop.model)