mysql - 避免选择重复的 MySQL 行

Question

我正在选择行

SELECT `playerid` FROM `lb-world` WHERE replaced=50 AND type=0 >= 0.01

但在我的桌子上我有

playerid | replaced | type | date
12       | 50       | 0    | 2010
12       | 50       | 0    | 2011
12       | 50       | 0    | 2012

如何只选择一次？

Answer 1

试试这个：

SELECT `playerid` FROM `lb-world` 
WHERE replaced=50 AND type=0
GROUP BY playerid, replaced, type

这应该是通用的。
无论如何，如果你确定你只想要 playerid，使用这个

SELECT DISTINCT playerid FROM lb-world
WHERE replaced=50 AND type=0

Answer 2

如果你只想要playerid，你可以使用DISTINCT

SELECT DISTINCT `playerid` FROM `lb-world` WHERE replaced=50 AND type=0 >= 0.01

Answer 3

SELECT DISTINCT playerid..

正如@Michael 所说