Question

大家好！有一个表只包含3列（'playerID'，'teamID'和'yearID'）

我只想获得具有相同年份并且在一个玩家的同一团队中的列。您可以看到以下代码：

Select playerID, teamID, yearID
FROM `appearancessmall`
WHERE (teamID IN 
(SELECT teamID from  `appearancessmall` WHERE playerID = 'napolmi01' )  
) AND
(yearID  IN (SELECT yearID from  `appearancessmall` WHERE playerID = 
'napolmi01')
)

但查询的输出是与播放器“napolmi01”具有相同teamID或相同yearID的总列，我想要的是选择的列应同时满足两个要求。那怎么办？

Answer 1

尝试使用以下示例中的LEFT JOIN

SELECT `et`.* FROM `test` `t`
LEFT JOIN `test` `et`
ON `t`.`teamID`=`et`.`teamID` AND `t`.`yearID`=`et`.`yearID`
WHERE `t`.`playerID`='napolmi01';

在SQL Fiddle

上试用

Answer 2

尝试组合2个子查询并同时比较两个列：

SELECT
   playerID
 , teamID
 , yearID
FROM `appearancessmall`
WHERE 
  (teamID,yearID) IN (
   SELECT teamID,yearID
   FROM `appearancessmall`
   WHERE playerID = 'napolmi01'
   )

选择一列与另一列具有相同属性的列

2 个答案: