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MariaDB Server is one of the most popular open-source relational databases. We need to install it in debug mode on our PC to test DataBase. The installation will take a few minutes, depending on your internet connection. Let’s create our first test with the next code: Test 00001: avarage --echo create table t1 ( pk int primary key, height int), calculate average (1,5), (2,4) and (3) with rows and (0,9)