帶有DISTINCT關鍵字的查詢有什麼問題？

Question

我想顯示dishname和dishprice與DISTINCT值第二高的dishprice。

以下查詢有什麼問題？

SELECT dishName, DISTINCT(dishPrice) FROM `tblDish` ORDER BY dishPrice LIMIT 1,1 

Answer 1

如果有更多的則同樣的價格一個記錄，則需要將它們分組再見價格和組CONCAT所有記錄

SELECT GROUP_CONCAT(dishName), dishPrice FROM `tblDish` GROUP BY dishPrice ORDER BY dishPrice DESC LIMIT 1,1 

Answer 2

做這樣的

SELECT DISTINCT(dishPrice), dishName FROM `tblDish` GROUP BY `dishPrice` ORDER BY `dishPrice` LIMIT 1,1 

你在選擇表格中的任何其他列之前，應始終提及Distinction

Answer 3

使用GROUP BY機智h查詢。所以，你可以列出和區分他們的類別。