calumhalcrow

PLEASE NOTE: We'd prefer you send your answers to [email protected] rather than post them publicly in another Gist, or in comments on this Gist ;-)

Engineer Skills Test

The following is a series of questions related to skills that we commonly use in our projects.

This is not a timed or monitored test, and you may use any print or online resources you would like to assist you in your work.

Please submit your answers in the form of text, markdown, or other lightweight data formats. Please indicate clearly which parts of your response correspond to which question. If your answers span multiple files, please attach them as a zip file.

calumhalcrow

PLEASE NOTE: We'd prefer you send your answers to [email protected] rather than post them publicly in another Gist, or in comments on this Gist ;-)

Enterprise Data Warehouse Engineer Skills Test

The following is a series of questions related to skills that we commonly use in our enterprise data warehouse (EDW).

This is not a timed or monitored test, and you may use any print or online resources you would like to assist you in your work.

Please submit your answers in the form of text, markdown, or other lightweight data formats. Please indicate clearly which parts of your response correspond to which question. If your answers span multiple files, please attach them as a zip file.

calumhalcrow

PLEASE NOTE: We'd prefer you send your answers to [email protected] rather than post them publicly in another Gist, or in comments on this Gist ;-)

1. Voting

Each voter can vote in zero or more referenda. Each referendum has one or more questions, and each question is a yes/no vote. Write the simplest normalized schema to describe this in generic SQL statements or as an entity-relationship diagram. Point out where the indexes would be if you want to quickly know the results of a given referendum question, but you never expect to query a single voter's voting record.

2. Cursors

Explain the difference between explicit and implicit cursors in PL/SQL. Give an example in which an explicit cursor can be used to solve a problem that cannot be solved (or cannot be solved easily) using implicit cursors.

calumhalcrow

NOTE: Please send your answers to [email protected] rather than post them publicly in another Gist or in comments on this Gist.

1. Voting

Each voter can vote in zero or more referenda. Each referendum has one or more questions, and each question is a yes/no vote. Write the simplest normalized schema to describe this in generic SQL statements or as an entity-relationship diagram. Point out where the indexes would be if you want to quickly know the results of a given referendum question, but you never expect to query a single voter's voting record.

2. Availability on AWS

Your client plans to host their web application on AWS. When would you advise (a) deployment in a single availability zone, (b) deployment in multiple availability zones in a single region (c) deployment in multiple regions? What operational difficulty or complexity, if any, is added as you go from (a) to (b) to (c)?

calumhalcrow

Installs ruby-2.0.0-p247 on ubuntu via checkinstall so it's in your package manager and you can remove it.

Quick install:

curl -Lo- https://gist.github.com/parasquid/5624732/raw/install-ruby-2-ubuntu.sh | bash