SQL查询-如何筛选出重复值

如果我有两个帐户（1和2），但我正在尝试筛选有苹果但没有桔子的帐户。根据这些数据，您将如何做到这一点

这就是我现在拥有的：

SELECT * 
FROM products p
join accounts a on a.id = p.id
join 
(
  SELECT account
  FROM products p
  join accounts a2 on a2.id = p.id
  WHERE products LIKE '%Apples%'
) a2.id = a.id    
WHERE products NOT LIKE '%Oranges%'

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您的查询和示例数据不一致。根据数据：

实际上，您可以简单地使用示例中的

having

子句：

having max(product) = 'Apples'

这使用了“苹果”按字母顺序出现在“橙子”之前的事实

SELECT * FROM "YourTableName" 
WHERE Account_# NOT IN (
    SELECT Account_# FROM "TheSameTableNameAsMentionedBefore" 
    WHERE Product = "Oranges"
);

它应该会起作用。但我不确定我是否正确理解了你的问题。你提到了“无重复项”。我建议你看一看。

---

您可以使用

exists

select *
from your_table t1
where exists (select 1 
              from your_table t2
              where t2.account_num=t1.account_num and product='Apples')
and not exists (select 1 from 
                your_table t2
                where t2.account_num=t1.account_num and product='Oranges');

select *
from your_table t1
where exists (select 1 
              from your_table t2
              where t2.account_num=t1.account_num and product='Apples')
and not exists (select 1 from 
                your_table t2
                where t2.account_num=t1.account_num and product='Oranges');