Mysql选择查询问题

Question

我正在使用下面给出的查询：

SELECT o.orders_id, o.customers_name, o.customers_id, o.payment_method, o.google_order_id, o.date_purchased, o.last_modified, o.currency, o.currency_value, s.orders_status_name
FROM orders o, orders_status s, customers c
WHERE o.customers_id = c.customers_id
AND o.orders_status = s.orders_status_id
AND c.customers_firstname = Nisha
OR c.customers_lastname = Nisha
OR c.customers_email_address = Nisha
OR c.customers_telephone = Nisha

它给出的错误为：#1054 - Unknown columns 'Nisha' in 'where Clause'

Y 是这样吗？有人可以指导我解决这个问题吗？

Answer 1

看起来您只需将 Nisha 括在引号中：'Nisha'

...
AND c.customers_firstname = 'Nisha'
OR c.customers_lastname = 'Nisha'
OR c.customers_email_address = 'Nisha'
OR c.customers_telephone = 'Nisha'

此外，尽管与此错误无关，但请注意，您应该将 AND/OR 条件分组括号中的 WHERE 条件：

WHERE (  o.customers_id = c.customers_id AND
         o.orders_status = s.orders_status_id
      ) AND
      (
         c.customers_firstname = 'Nisha' OR
         c.customers_lastname = 'Nisha' OR
         c.customers_email_address = 'Nisha' OR
         c.customers_telephone = 'Nisha'
      )