Where we are going, we need to keep track of the history in the tables.
How to set up and use Temporal Tables in Microsoft SQL Microsoft SQL has native support for keeping track of Insert / Update / Delete from system versioned tables. The following explains how to set up and use temporal tables in Microsoft SQL.
Where do you live? May be a simple question, but when companies are asking where someone lives, the answer isn’t always so easy. The physical address and the mailing address of a person can be two completely separate things. And when companies want to send direct mail, they need to ensure the message is appropriate.
Today I am going to show a Python program that I wrote that can process millions of addresses and verify if the address is a valid mailing address that matches the physical address. And how the majority of online mapping services get it wrong.
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.
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.
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.
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.
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.
Below are some examples of how to create tables in Oracle 12. PL/SQL, for the most part PL/SQL follows standard SQL conventions.
Updated: 2021-10-02 for R version 4.1
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?
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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