Coding Musings

Trying to share some code ideas

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Month: February 2018

Computing the Minimum Number of Flight Segments

Computing the Minimum Number of Flight Segments

If we want to compute the minimum number of flight segments between a starting city and target city, we can construct an undirected graph.  In the graph the nodes represent cities and the edges represent the flight segments.  We can count the number of segments to determine the shortest distance.

The following can be applied to any situation in finding the shortest path.  It is an implementation of the breadth first search algorithm.

See code below.

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Modeling and Prediction for Movie Audience Ratings

Modeling and Prediction for Movie Audience Ratings

Synopsis

One of the key issues facing film production companies is, will the production company make a profit from a movie. It is assumed that favorable audience reviews will in-turn lead to higher ticket sales or DVD sales, both items directly affect a movie’s profitability.

The analysis will look at what attributes lead to a higher average audience review score on the public website, Rotten Tomatoes

Spoiler Alert The analysis creates a model that is close, but isn’t 100% confident.

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Blazin’ Burger Business Performance Metrics

Blazin’ Burger Business Performance Metrics

Over the last year, the three New York locations of fast-food restaurant Blazin’ Burger have
produced mixed financial results.

Below is a presentation-ready dashboard that will show

  • KPI’s that show performance data from each location
  • External data from NYC board of health

Below are dashboards created using MicroStrategy.

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Oracle PL/SQL More Aggregation – Rank

Oracle PL/SQL Aggregation  – Rank

One of the more interesting aggregation functions is RANK.  After doing a standard SELECT and GROUP BY; you can then have SQL rank the results using an aggregated value from another column.

Let’s dive in and look at how RANK works and what can it do for us.

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Oracle 12c Limit Rows Returned

Limit Rows Returned

Previous to Oracle 12c limit the number of rows returned usually meant encapsulating the query as a subquery.  It wasn’t particularly nice looking and was out of alignment with other relational database query languages.

MySQL uses the LIMIT operator and Microsoft T-SQL uses the TOP operator. In Oracle 12c, Oracle introduced the FETCH FIRST operator.  Let’s see how it works.

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Oracle PL/SQL Subtotal Operators

Oracle PL/SQL Subtotal Operators

There are times when we need not just the total value for the column, but subtotal values depending on different column values.  Oracle supports subtotal operators through the three key operators they are CUBE, ROLLUP, and GROUPING SETS. Below are examples of each one and how best to use them.

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Aggregation in Oracle PL/SQL

Aggregation in Oracle PL/SQL

Oracle 12 uses normal SQL statements when doing aggregation.  The standard rules for aggregating in SQL apply.  You need to group by all non aggregated columns and having clause will be evaluated after the group by operator.

Some examples of aggregation in Oracle PL/SQL are below.

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Dropping Tables in Oracle PL/SQL

Dropping Tables

Below are some examples of how to create tables in Oracle 12. PL/SQL, for the most part PL/SQL follows standard SQL conventions.

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R Markdown to WordPress

Posting an Rmd File to WordPress

There are four R packages you will need to be able to post an Rmd file to WordPress. Yes there are alternatives you can generate the HTML yourself and copy and paste things, but why would you want to do it?

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Creating Tables in Oracle 12 PL/SQL

Creating Tables

Below are some examples of how to create tables in Oracle 12. PL/SQL. For the most part PL/SQL follows standard SQL conventions.  I will show how to create some tables and some of the more popular options when creating tables.

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