As we lever MySQL to build database solutions, we might need to build a MySQL recursive query. This article will show how to use MySQL recursion.
As we lever MySQL to build database solutions, we might need to build a MySQL recursive query. In an earlier Database Journal article, I showed how to solve an integer parsing problem with SQL Server recursion. This article will show how to solve that same problem with MySQL recursion, highlighting the strong and weak points of this MySQL feature.
As a basic understanding, we can say that recursive software calls itself in a controlled, structured way. According to the classic definition, recursive software needs the below:
But in practice, we can add the below to the mix as requirements:
Recursion has many more considerations, aspects, and fine points, but we have enough information here to proceed. MySQL, combined with readily available modern hardware, covers all these requirements, so we can build a MySQL recursive query. The software samples we’ll see here assume a MySQL 8.0.19 environment.
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Recursion is the one idea I constantly use while I solve coding problems. Most of the time I don’t start by thinking “RECURSION WILL SOLVE THIS!”. However recursion just ends up being the logical way to reach an answer.