Join Sheeri Cabral for an in-depth discussion in this video Separating lists of objects in a multivalued field, part of Understanding MariaDB for MySQL Users.
…Sometimes you come across a table that has more than one piece of…information in one field.…A column with multiple values is called a multi-valued column.…Let's look at the example file called children.txt.…Since we're already inside of MariaDB,…let's use backslash exclamation point to run a command on the shell.…And let's do more /var/tmp/children.txt to look at this file in the examples.…This is a semicolon-delimited file with two fields, parent and children.…
Children is a multi valued field, where the values are separated by commas.…First let's make it so…we can access the data in this file by creating a CONNECT table.…So let's CREATE TABLE children.…And there are going to be two fields.…Just like our file called parent, which will be a VARCHAR 32 NOT NULL.…And children for the list of children,…which we'll put as a VARCHAR 100 NOT NULL and a DEFAULT of blank.…The ENGINE is going to be CONNECT and the TABLE_TYPE is a CSV.…
The underlying FILE_NAME is /var/tmp/children.txt.…And we have a HEADER line.…So we say HEADER equals 1.…
- Why use dynamic columns?
- Creating, updating, and querying dynamic columns
- Installing the CONNECT storage engine
- Connecting to remote data
- Connecting to CSV, INI, and XML files
- Using PIVOT tables
- Accessing database metadata
- Working with the Cassandra storage engine
Skill Level Intermediate
Ruby on Rails 4 Essential Trainingwith Kevin Skoglund12h 41m Beginner
1. Dynamic Columns
2. The Power of CONNECT
3. Advanced CONNECT Storage Engine
4. The Cassandra Storage Engine
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