如何在单个sql表中合并两个记录的相同字段

Question

Am maintaining a data base named CustomerInfo for multiple employees, whenever a customer contacts me am inserting that customer details into the table.... If the same customer calls again and again, am inserting as new record with only id number and product for which the call made is differed...

If i search table with id it returns only one record, but if i search with phone number or email id it may give multiple record, Now i want the return record as follows

Customer Name, Phone Number, Email Id, product1,product2,...

Is it possible to do like this in SQL...? If so please explain me...

Answer 1

You can do this with aggregation and group_concat() :

select CustomerName, PhoneNumber, EmailId, group_concat(product)
from CustomerInfo
group by CustomerName, PhoneNumber, EmailId;

That said, your database should have at least two tables. One for customers with their contact information. And another, CustomerProducts for the product information. This is called "normalization" and you should be familiar with this concept if you are using relational databases. There are many good explanations online.