How to get data of another table in mysql?

Question

Table 1: kpi_detail column[redValue, amberValue, greenValue]
Table 2: data_detail 


$sql= "SELECT id,kpi_code,kpi_name,result_data,target, count_date, SUM(result_data) AS total_data, assign FROM data_detail GROUP BY kpi_code";

Expected table columns results:
id| kpi_code | kpi_name | result_data | target | count_date | total_data | assign | redValue | amberValue | greenValue |

It looks like the GROUP BY is giving me trouble on joining two tables. How do I get the 3 columns of table1 kpi_detail ? Join the 3 columns from table 2 to table 1

Answer 1

You have "bare" columns in the GROUP BY . You should be using aggregation functions for all the columns not in the GROUP BY :

SELECT MAX(id), kpi_code, MAX(kpi_name), MAX(result_data),
       MAX(target), MAX(count_date), SUM(result_data) AS total_data,
       MAX(assign)
FROM data_detail
GROUP BY kpi_code