如何比较一个表与自己在一个条件下的mysql

嗨，我需要一些帮助，我有一个表销售如下..我想比较它本身，并显示结果公司应该不等于公司和价格应该等于价格..我已经尝试了许多查询在MySQL中，但没有得到所需的结果，请帮助我做到这一点！告诉正确的查询将非常感谢你们！如何比较一个表与自己在一个条件下的mysql

sells(company,drink,price)

查询我试图

mysql>'select company,drink,price from sells JOIN s ON(price=price1) where (comp 
any1!=company);'

而s的卖出

+----------------+----------------+-------+ 
| company  | drink   | price | 
+----------------+----------------+-------+ 
| PepsiCo  | Mirinda  | 45 | 
| PepsiCo  | Pepsi   | 45 | 
| Coca-Cola  | Coca-cola zero | 45 | 
| Nestle   | Nescafe  | 35 | 
| Nestle   | Nescafe  | 35 | 
| Nestle   | Nescafe  | 35 | 
| Nestle   | Nescafe  | 35 | 
| Nestle   | Nescafe  | 35 | 
| Nestle   | Nescafe  | 35 | 
| Coca-Cola  | Coca-cola zero | 45 | 
| Shezan   | Twister  | 25 | 
| Nestle   | Fruita vitals | 25 | 
| Murree Brewery | Big Apple  | 35 | 
| Murree Brewery | Big Lemon  | 35 | 
| Murree Brewery | Big Orange  | 35 | 
| Murree Brewery | Peach Malt  | 35 | 
| Murree Brewery | Lemon Malt  | 35 | 
| Murree Brewery | Apple Malt  | 35 | 
+----------------+----------------+-------+

来源

2013-09-26 Ali Imtiaz

-1

的副本表试试这个？

SELECT T1.company, T2.company, T1.price 
FROM sells T1 
JOIN sells T2 
WHERE 
T1.company != T2.company 
AND 
T1.price = T2.price 
GROUP BY T1.company, T1.price;

来源

2013-09-26 18:57:25

谢谢:)它的工作但你能解释一下这个请 –

如何比较一个表与自己在一个条件下的mysql

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