Skills used in Data Science

Not all data scientist are alike. Some do general work while others focus on domains such as health, technology, or business. They can work in predictive analysis, big data, spatial data, or any combination of these. Based on their requirements they require different technical skills.


Following some technology trends that I have observed.

Data Science

A chemist studies chemical properties of objects. A biologist studies living beings. A data scientist studies data. Data is real. It has real properties. Study of data leads to information and knowledge. Answering questions with data leads to revelation, understanding, and wisdom.

Listing all tables and their table counts in a MySQL database

The Following SQL query will list all tables in a MySQL database and also list the row counts for each.

FROM `information_schema`.`tables` 
WHERE `table_schema` = 'mydatabase';

where mydatabase is the name or your database. The output will like something like the following:

| table_name | table_rows |
| lines      |       2271 |
| links      |        484 |
| word       |      25004 |

Displaying multiple fields in a single line in drupal7 views

Suppose you have three fields (Title, field_city, field_country) to display in your view. By default they will display in three separate lines as follows:

Benjamin Franklin

To display this information in a single line, you need to edit the third field. Expand Rewrite Results, then type in the following:

[Title], [field_city], [field_country]

This will result in the following:

Benjamin Franklin, Philadelphia, USA 

Fatal error: Allowed memory size exhausted

Drupal can be very memory intensive CMS, especially if you have lots of menus, blocks and modules. If you exhaust the allowed memory size, you would get an error such as the following

Fatal error: Allowed memory size of 16777216 bytes exhausted (tried to allocate 41 bytes) in somefile

To fix this problem, you need to allocate more memory.

1. Open you php.ini file If you don't know where this file is, run locate php.ini. Mine is located at /etc/php.ini. Make sure you back up this file before editing it.