concat
How to concatenate string variables in Bash
In general to concatenate two variables you can just write them one after another:
Convenient way to deal with ValueError: cannot reindex from a duplicate axis
Operations between series require non-duplicated indices, otherwise Pandas doesn’t know how to align values in calculations. This isn’t the case with your data currently. If you are certain that your series are aligned by position, you can call reset_index on each dataframe:
String concatenation in MySQL
I am using MySQL and MySQL Workbench 5.2 CE. When I try to concatenate 2 columns, last_name and first_name, it doesn’t work :