在Dreamweaver中的MySQL记录集中存在歧义错误

Question

每当我尝试对其进行测试时，Dreamweaver中的以下记录集都会引发1052模糊错误。 我知道它与dateADDED有关，但不知道如何解决。

    SELECT commentID, commentTitle, commentContent, topicTable.topicTitle,  DAYNAME(dateADDED) as day, MONTHNAME(dateADDED) as month, 
DAY(dateADDED) as date, YEAR(dateADDED) as year
FROM commentTable, topicTable
WHERE commentID = colname AND topicTable.topidID = commentTable.topicID

这是表格的布局，

CREATE TABLE userTable
(
userID VARCHAR(15) NOT NULL,
screenName VARCHAR(15) NOT NULL UNIQUE,
userPasswd CHAR(40) NOT NULL,
firstName VARCHAR(15) NOT NULL,
lastName VARCHAR(25) NOT NULL,
dateJoined TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
lastlogin DATETIME,
PRIMARY KEY(userID)
)
;

CREATE TABLE categoryTable                                          
(
categoryID MEDIUMINT AUTO_INCREMENT NOT NULL,                       
categoryName VARCHAR(30) NOT NULL,                                  
categoryDescription VARCHAR(200) NOT NULL,                          
PRIMARY KEY (categoryID)
)
;

CREATE TABLE topicTable                                             
(
topicID MEDIUMINT AUTO_INCREMENT NOT NULL,                          
topicTitle VARCHAR(30) NOT NULL,                                    
userID VARCHAR(15) NOT NULL,                                        
dateAdded TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,             
categoryID MEDIUMINT NOT NULL,                                      
PRIMARY KEY (topicID)
)
;

CREATE TABLE commentTable                                           
(
commentID MEDIUMINT AUTO_INCREMENT NOT NULL,                        
commentTitle VARCHAR(30) NOT NULL,                                  
commentContent TEXT NOT NULL,                                       
userID VARCHAR(15) NOT NULL,                                        
dateAdded TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,             
topicID INT NOT NULL,                                               
PRIMARY KEY (commentID)
)
;

Answer 1

dateADDED在两个表中都有表示，因此您应该从结果表中选择一个：

SELECT ct.commentID
     , ct.commentTitle
     , ct.commentContent
     , tt.topicTitle
     , DAYNAME(ct.dateADDED) as `day`
     , MONTHNAME(ct.dateADDED) as `month`
     , DAY(ct.dateADDED) as `date`
     , YEAR(ct.dateADDED) as `year`
FROM commentTable ct
JOIN topicTable tt ON ct.commentID = tt.colname  AND tt.topidID = ct.topicID

顺便说一句，仍然不知道，什么colname代表，也许应该是ct.userID = tt.userID呢？