Question

tbl_attendance

CREATE TABLE `tbl_instructor_info` (
  `ID` int(11) NOT NULL AUTO_INCREMENT,
  `InstructorID` varchar(7) NOT NULL,
  `Name` varchar(50) NOT NULL,
  `Mobile` varchar(11) NOT NULL,
  `Email` varchar(50) NOT NULL,
  `Trade` int(1) NOT NULL,
  `TSP` int(1) NOT NULL,
  PRIMARY KEY (`ID`),
  UNIQUE KEY `InstructorID` (`InstructorID`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8

tbl_assigned

CREATE TABLE `tbl_assigned` (
  `ID` int(11) NOT NULL AUTO_INCREMENT,
  `Round` int(2) DEFAULT NULL,
  `TraineeID` varchar(7) DEFAULT NULL,
  `Name` varchar(25) DEFAULT NULL,
  `Mobile` int(10) DEFAULT NULL,
  `BatchID` varchar(35) DEFAULT NULL,
  `Remarks` varchar(8) DEFAULT NULL,
  `District` varchar(15) DEFAULT NULL,
  `Comments` varchar(21) DEFAULT NULL,
  `Level` varchar(2) DEFAULT NULL,
  `Trade` int(1) DEFAULT NULL,
  `Status` int(1) DEFAULT NULL,
  `Photo` varchar(50) DEFAULT NULL,
  PRIMARY KEY (`ID`),
  KEY `TraineeID` (`TraineeID`)
) ENGINE=InnoDB AUTO_INCREMENT=356 DEFAULT CHARSET=utf8

tbl_instructor_info

CREATE TABLE `tbl_attendance` (
  `ID` int(11) NOT NULL AUTO_INCREMENT,
  `TraineeID` varchar(7) NOT NULL,
  `attnDate` date NOT NULL,
  `inTime` time NOT NULL,
  `outTime` time NOT NULL,
  `Status` varchar(10) NOT NULL,
  PRIMARY KEY (`ID`)
) ENGINE=InnoDB AUTO_INCREMENT=316 DEFAULT CHARSET=latin1

TraineeID中出现含糊不清的错误。我为varchar使用了TraineeID类型数据。 Where子句也会产生错误。请求帮助我得到这个结果。

SET @sql = NULL;
SELECT
    GROUP_CONCAT(DISTINCT
    CONCAT('MAX(IF(`TraineeID`= ', `TraineeID`, ',"P","A")) AS ID',`TraineeID`)
            ) INTO @sql
    FROM tbl_attendance t1 JOIN tbl_assigned t2 
    ON t1.TraineeID=t2.TraineeID
    WHERE t2.BatchID='ID-Electronics/FMMTTC-01M/R7/01';  
    SET @sql = CONCAT('SELECT DATE_FORMAT(attnDate,"%d-%m-%Y")AS Date, ', @sql, ' 
    FROM tbl_attendance
    WHERE attnDate BETWEEN ',2015-12-01,' and ',2015-12-02,'
    GROUP BY attnDate');

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

TraineeID中的tbl_attendance中的某些tbl_assigned不在TraineeID表中。实际上tbl_attendance中的tbl_assigned与两个数据表匹配。一个是tbl_Instructor_Info表，另一个是SET @sql = NULL; SELECT GROUP_CONCAT(DISTINCT CONCAT('MAX(IF(`t1.TraineeID`= ', `t1.TraineeID` or `t3.InstructorID`, ',"P","A")) AS ID',`t1.TraineeID`) ) INTO @sql FROM tbl_attendance t1 JOIN tbl_assigned t2 ON t1.TraineeID=t2.TraineeID Join tbl_instructor_info t3 ON t1.TraineeID=t3.InstructorID WHERE t2.BatchID='ID-Electronics/FMMTTC-01M/R7/01'; SET @sql = CONCAT('SELECT DATE_FORMAT(attnDate,"%d-%m-%Y")AS Date, ', @sql, ' FROM tbl_attendance WHERE attnDate BETWEEN ',2015-12-01,' and ',2015-12-02,' GROUP BY attnDate'); PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;。我应该使用如下：

SET @sql = NULL;
SELECT
    GROUP_CONCAT(DISTINCT
    CONCAT('MAX(IF(`TraineeID`= ', `TraineeID`, ',"P","A")) AS ID',`TraineeID`)
            ) INTO @sql
    FROM tbl_attendance;  

    SET @sql = CONCAT('SELECT DATE_FORMAT(attnDate,"%d-%m-%Y")AS Date, ', @sql, ' 
    FROM tbl_attendance
    WHERE attnDate BETWEEN ',2015-12-01,' and ',2015-12-02,'
    GROUP BY attnDate');

select @sql as aboutToUse;

-- PREPARE stmt FROM @sql;
-- EXECUTE stmt;
-- DEALLOCATE PREPARE stmt;

这是没有任何标准的转储; 查询：

TraineeID

转储数据 SELECT DATE_FORMAT（attnDate，＆＃34;％d-％m-％Y＆＃34;）AS Date，MAX（IF（TraineeID = 22779，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID22779，MAX（IF（TraineeID = 22780，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID22780，MAX（IF（TraineeID } = 24321，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID24321，MAX（IF（TraineeID = 24870，＆＃34; P＆＃34;，＆＃34） ; A＆＃34;））AS ID24870，MAX（IF（TraineeID = 24871，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID24871，MAX（IF（{{ 1}} = 25099，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID25099，MAX（IF（TraineeID = 25199，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID25199，MAX（IF（TraineeID = 25304，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID25304，MAX（IF（ TraineeID = 25308，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID25308，MAX（IF（TraineeID = 25515，＆＃34; P＆＃34; ，＆＃34; A＆＃34;））AS ID25515，MAX（IF（TraineeID = 25549，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID25549，MAX（ IF（TraineeID = 25552，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID25552，MAX（IF（TraineeID = 25560，＆＃34; P＆＃） 34;，＆＃34; A＆＃34;））AS ID25560，MAX（IF（TraineeID = 25571，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID25571， MAX（IF（TraineeID = 25592，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID25592，MAX（IF（TraineeID = 25594，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID25594，MAX（IF（TraineeID = 25597，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID25597，MAX（IF（TraineeID = 25600，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID25600，MAX（IF （TraineeID = 25710，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID25710，MAX（IF（TraineeID = 26105，＆＃34; P＆＃34） ;，＆＃34; A＆＃34;））AS ID26105，MAX（IF（TraineeID = 26145，＆＃34; P＆＃34;，＆＃34; A＆＃34;））AS ID26145，MAX （IF（TraineeID = 26147，＆＃34; P＆＃34;，＆＃34; A＆＃34;））A 来自tbl_attendance 在2002年和2001年之间的关系 GROUP BY attnDate

Answer 1

在这一行

CONCAT('MAX(IF(`TraineeID`= ', `TraineeID`, ',"P","A")) AS ID',`TraineeID`)

您需要为t1指定哪个表别名（t2或TraineeID）

该列出现在两者中。

直到那时，

1052：字段列表中的“TraineeID”列不明确

mysql中转置行到列的模糊错误

1 个答案: