Mysqli-＃1052-字段列表中的列“ id”不明确

Question

SELECT id,firstName,lastName, SUM(qty*price) 
       FROM orders,menu,customers  
       WHERE menu.id = orders.id_menu 
         AND orders.id_customer = customers.id 
 GROUP BY (id,firstName,lastName) 
 ORDER BY (SUM(qty*price)) LIMIT 1;

1052 - Column 'id' in field list is ambiguous

i need to get the best customer

Answer 1

Some simple rules when writing SQL:

• Never use commas in the FROM clause.
• Always use explicit, proper JOIN syntax.
• Always alias your tables with abbreviations.
• Always qualify your column references.

Your resulting queries are more likely to work the first time:

SELECT c.id, c.firstName, c.lastName, SUM(o.qty * m.price)
FROM orders o JOIN
     menu m
     ON m.id = o.id_menu JOIN
     customers c 
     ON  c.id = o.id_customer
GROUP BY c.id, c.firstName, c.lastName
ORDER BY SUM(o.qty * m.price)
LIMIT 1;

Answer 2

Change the query to this

SELECT customers.id,firstName,lastName, SUM(qty*price) FROM orders,menu,customers  WHERE menu.id = orders.id_menu AND orders.id_customer = customers.id GROUP BY (customers.id,firstName,lastName) ORDER BY (SUM(qty*price)) LIMIT 1;

I believe all these tables have column called 'id' and you need to specify which one you need otherwise it will give you this message.

Answer 3

您在不同的表中有许多列作为名称“ id”，因此mysql无法知道它的来源（menu.id与customer.id）。

Answer 4

change to:

SELECT id,firstName,lastName, SUM(qty*price) 
   FROM orders,menu,customers  
   WHERE menu.id = orders.id_menu 
     AND orders.id_customer = customers.id 
GROUP BY (orders.id,firstName,lastName) 
ORDER BY (SUM(qty*price)) LIMIT 1;

you want orders.id as those will be associated with qty and price