避免選擇複製的MySQL行

Question

與

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

我選擇行，但在我的表我有

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

如何選擇它只是一次？

Answer 1

如果你只是想playerid，您可以使用DISTINCT

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

Answer 2

試試這個：

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

這應該是通用的。
無論如何，如果你確信你只是想playerid，使用此

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

Answer 3

SELECT DISTINCT playerid.. 

爲@邁克爾說