在Dreamweaver中的MySQL記錄集中存在歧義錯誤

Question

每當我嘗試對其進行測試時，Dreamweaver中的以下記錄集都會引發1052模糊錯誤。 我知道它與dateADDED有關，但不知道如何解決。

    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

這是表格的布局，

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在兩個表中都有表示，因此您應該從結果表中選擇一個：

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

順便說一句，仍然不知道，什么colname代表，也許應該是ct.userID = tt.userID呢？