MySQL - 如何添加別名語法到子查詢

Question

我是MySQL的新手，仍然有其語法問題。我有這個疑問：

SELECT a, b, c, d, e 
FROM table1 
WHERE status = 'skipped' 
AND batchid IN (SELECT batchid 
       FROM (SELECT distinct batchid, date_format(uploaddate, '%Y-%m-%d') 
         FROM table1 
         WHERE uploaddate > '2011-01-26') AS t 
       ) AS t; 

這給了我這個錯誤：

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'as t' at line 1 

IN子句的工作原理：

SELECT batchid 
FROM (SELECT distinct batchid, date_format(uploaddate, '%Y-%m-%d') 
     FROM table1 
     WHERE uploaddate > '2011-01-26') AS t 

我想我的問題有事情做與第二表的別名。有人能告訴我我做錯了什麼嗎？

Answer 1

對於出現在WHERE子句中的子查詢，您不需要別名。

離開最後的AS t（就在分號之前），一切都會好的。