Question

SELECT A.* , B.* FROM
(SELECT ID,DATE FROM APPLE) A
INNER JOIN 
(SELECT ID,MAX(DATE) AS MAXDATE FROM APPLE GROUP BY ID) A1
ON A.ID = A.ID AND A.DATE = A1.MAXDATE
WHERE A.DATE > CURRENT_DATE
LEFT OUTER JOIN (
SELECT ID,NAME FROM BANANA) B
ON A.ID = B.ID 
WHERE B.NAME IN ('USA','GBR') LIMIT 10;

错误：编译语句时出错：FAILED：ParseException行 22：0在'CURRENT_DATE'附近的'LEFT'处缺少EOF （状态= 42000，代码= 40000）

Answer 1

WHERE子句，即A.DATE > CURRENT_DATE应位于第一个选择内。另请注意，您的条件为A.ID = A.ID，而不是A.ID = A1.ID

SELECT 
     A.* , B.* 
FROM 
    (SELECT ID,DATE FROM APPLE WHERE DATE > CURRENTDATE) A
INNER JOIN  
    (SELECT ID,MAX(DATE) AS MAXDATE FROM APPLE GROUP BY ID) A1
ON 
     A.ID = A1.ID AND A1.DATE = A1.MAXDATE 
LEFT OUTER JOIN 
     (SELECT ID,NAME FROM BANANA) B
ON 
     A.ID = B.ID 
WHERE B.NAME IN ('USA','GBR') LIMIT 10;

Answer 2

您的问题是您在SQL语句中间有一个WHERE子句。您可以将其移动到A的嵌套查询中，也可以将其添加到最后的WHERE子句中。您可能还希望在嵌套查询中移动B表上的过滤，因为您实际上是通过将左连接放在语句末尾的WHERE子句中而将其设置为内连接。

或者

    SELECT A.* , B.* FROM
   (SELECT ID,DATE FROM APPLE WHERE DATE > CURRENT_DATE) A
   INNER JOIN 
   (SELECT ID,MAX(DATE) AS MAXDATE FROM APPLE GROUP BY ID) A1
   ON A.ID = A.ID AND A.DATE = A1.MAXDATE
   LEFT OUTER JOIN (
   SELECT ID,NAME FROM BANANA WHERE NAME IN ('USA','GBR') ) B
   ON A.ID = B.ID 
   LIMIT 10;

或

    SELECT A.* , B.* FROM
    (SELECT ID,DATE FROM APPLE) A
    INNER JOIN 
    (SELECT ID,MAX(DATE) AS MAXDATE FROM APPLE GROUP BY ID) A1
    ON A.ID = A.ID AND A.DATE = A1.MAXDATE
    LEFT OUTER JOIN (
    SELECT ID,NAME FROM BANANA WHERE NAME IN ('USA','GBR') ) B
    ON A.ID = B.ID 
    WHERE A.DATE > CURRENT_DATE
    LIMIT 10;

运行配置单元连接查询时出错

2 个答案: