Merging multiple rows into one row and multiple columns on mysql

Question

I am working in MYSQL and need to extract user data to be pulled into a view. I will be using the data in an email client, so I cannot do this in the app layer.

The

Answer 1

Here is an another solution that doesn't need additional join operations, instead, we make use of group by statement along with case statement.

select um.user_id,
       max(case when um.meta_key ='first_name' then um.meta_data end) AS first_name,  
       max(case when um.meta_key ='last_name' then um.meta_data end) AS last_name  ,
       max(case when um.meta_key ='email' then um.meta_data end) AS email
from wp_usermeta um 
group by user_id;

Note the max function is just for making them into one row, you can use min as well.

Check SQL Fiddler Demo here