Question

任何人都可以在这里看到错误。 PhpMyAdmin告诉我在where子句附近有错误。

SELECT product.*, category.*,store.*
WHERE
  store.store_id = product.store_id AND
  category.category_id = product.category_id
INNER JOIN store ON store.store_name = 'mens'
INNER JOIN category ON category.category_name = 'rings'

Answer 1

INNER JOIN属于FROM子句，而不属于WHERE子句。 FROM子句完全缺失。

SELECT product.*, category.*, store.*
  FROM product, category, store
 WHERE store.store_id = product.store_id AND
       category.category_id = product.category_id AND
       store.store_name = 'mens' AND
       category.category_name = 'rings'

Answer 2

你的sql中没有FROM子句。

select product.*, category.*, store.* from product 
inner join ....

Answer 3

您似乎混淆了where和on条款的目的。

SELECT product.*,category.*,store.* 
From Product
INNER JOIN store on store.store_id = product.store_id
inner join category on category.category_id = product.category_id 
where store.store_name= 'mens' and category.category_name = 'rings'

Answer 4

Select查询中的每个主要子句必须按正确顺序排列。

订单是：

Select ... [Output fields and expressuions] -- Required
From ...  [list of tables, with joins and join conditions] -- Required
Where [Predicates and filter conditions]  -- Optional
Group By [list of fields/expressns to group results by] -- reqr'd for aggregate queries
Order By [List of fields and expressions to sort results by -- optional

我无法弄清楚的SQL错误

4 个答案: