如何獲得在另一個表中定義的列值

任何人都可以幫助我獲得預期的輸出？我還添加了數據庫結構如何獲得在另一個表中定義的列值

TABLE1

ID Work Id Question      Column Column Type 
1 1 What is your name?  field1 String 
2 1 is you have mobile number? field2 boolean 
3 2 is you have passport?  field2 boolean 
4 2 are you indian?    field4 boolean 
5 2 abc?       field5 Number 
6 3 cde?       field2 boolean

TABLE2

Id WorkId field1 field2 field3 field4 field5 
1 1 JOHN  1   
2 2   1  0 1 
3 3   0

期望輸出

Work Id Question     Answer 
1 What is your name?   JOHN 
1 is you have mobile number? 1 
2 is you have passport?   1 
2 are you indian?     0 
2 abc?       1 
3 cde?       0

表結構

CREATE DATABASE /*!32312 IF NOT EXISTS*/`testtest` /*!40100 DEFAULT CHARACTER SET utf8 */; 

USE `testtest`; 

/*Table structure for table `table1` */ 

DROP TABLE IF EXISTS `table1`; 

CREATE TABLE `table1` (
    `Id` int(11) NOT NULL AUTO_INCREMENT, 
    `WorkId` int(11) DEFAULT NULL, 
    `Question` varchar(100) DEFAULT NULL, 
    `ColumnRef` varchar(100) DEFAULT NULL, 
    `ColumnType` varchar(100) DEFAULT NULL, 
    PRIMARY KEY (`Id`) 
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8; 

/*Data for the table `table1` */ 

insert into `table1`(`Id`,`WorkId`,`Question`,`ColumnRef`,`ColumnType`) values (1,1,'What is your name?','field1','String'),(2,1,'is you have mobile number?','field2','boolean'),(3,2,'is you have passport?','field2','boolean'),(4,2,'are you indian?','field4','boolean'),(5,2,'abc?','field5','Number'),(6,3,'CDE?','field2','boolean'); 

/*Table structure for table `table2` */ 

DROP TABLE IF EXISTS `table2`; 

CREATE TABLE `table2` (
    `id` int(11) NOT NULL AUTO_INCREMENT, 
    `workid` int(11) DEFAULT NULL, 
    `field1` varchar(11) DEFAULT NULL, 
    `field2` int(11) DEFAULT NULL, 
    `field3` int(11) DEFAULT NULL, 
    `field4` int(11) DEFAULT NULL, 
    `field5` int(11) DEFAULT NULL, 
    PRIMARY KEY (`id`) 
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8; 

/*Data for the table `table2` */ 

insert into `table2`(`id`,`workid`,`field1`,`field2`,`field3`,`field4`,`field5`) values (1,1,'JOHN',1,NULL,NULL,NULL),(2,2,NULL,1,NULL,0,1),(3,3,NULL,1,NULL,NULL,NULL);

來源

2014-02-07 Nilesh Patil

你可以添加你的表結構.. –

我已添加表格結構 –

您將如何決定將要使用哪個字段作爲答案 –

希望這將幫助你

SELECT t1.workid AS 'workid',t1.Question AS 'Question', 
COALESCE(`field1`,`field2`,`field3`,`field4`,`field5`) AS 'Answer' 
FROM table1 AS t1 
JOIN table2 AS t2 ON t1.workid = t2.workid

SQL Fiddle

來源

2014-02-07 10:48:39

感謝Ashish，coalesce函數中發生的一個問題不計算爲NULL值。我試圖指出約翰來了多少次，有多少次真實或虛假的價值來了。有些時候用戶沒有選擇選項那個時間值存儲爲空，所以這意味着該數據不可用於該字段，我想顯示該報告的''माहितीउपलब्धनाही'' –

@NileshPatil我認爲問題出在你的表中結構更新你的表格結構。發佈「我想顯示該報告」的新問題''माहितीउपलब्धनाही''「還閱讀了關於如何替換mysql中的空值 –

如果此答案真的可以幫助您，您應該接受此答案 –

如何獲得在另一個表中定義的列值

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