将文本（标签）分配给 SQL 查询结果中的值答案

【问题标题】：Assign Text (Label) to values in SQL Query Result将文本（标签）分配给 SQL 查询结果中的值
【发布时间】：2021-03-27 17:30:34
【问题描述】：

我的表格中的所有数据都是数字格式。例如，

class   sex subject medium
    5     1   1       1
    1     1   1       2
    4     3   3       1
    5     1   3       2
    1     1   3       1
    3     1   2       2
    1     2   2       2

其他表包含对每个表的每个值的描述。例如，

Table       Column      value       text
Student     class       1            1ST
Student     class       2            2ND
Student     class       3            3RD
Student     class       4            4TH
Student     class       5            5TH
Student     sex         1            male
Student     sex         2            female
Student     sex         3            creator
Student     medium      1            English
Student     medium      2            Hindi

我正在尝试提供文本（用户查询时为每列添加标签）。我已经能够为一栏做到这一点。例如，

SELECT class, sex, avg(total_marks) as total
FROM (
SELECT value, text as sex
FROM Label 
WHERE table_name = 'Student' and
    Column = 'class' or
 ) AS Label INNER JOIN  Student on value = class
GROUP BY class, sex

这会导致

class   sex total
1ST     1   64.80
1ST     2   59.66
2ND     1   78.96
2ND     2   96.97
3RD     1   52.67
3RD     2   81.77
4TH     1   61.99
4TH     2   99.78
5TH     1   72.90
5TH     2   70.59

我想展示男性、女性和创造者，而不是性别中的 1 / 2 /3。 Select 和 Group by 列有时可能超过 4 个。我正在使用 MySql 和 PHP Laravel 来执行此操作。

【问题讨论】：

您好！你为什么不向我们展示你迄今为止在 Laravel 中所做的事情？

标签： php mysql laravel

【解决方案1】：

我想我找到了答案。欢迎提出任何建议。

SELECT T1.class, T2.sex,  SUM(weight) 
FROM household_characteristics 
    INNER JOIN (SELECT value_label_name as code, value_label_value FROM labels      
WHERE table_name = 'Student' and columns = 'class' ) AS T1 ON T1.code =   Student.class
INNER JOIN (SELECT value_label_name as code, value_label_value FROM labels      
WHERE table_name = 'Student' and columns = 'sex' ) AS T2 ON T2.code = Student.sex
GROUP BY  class, sex

【讨论】：