SQL Essentials · DISTINCT
List active categories — a training organization · training scenario
List active categories in the context of a training organization, with a controllable result. You must produce the result, check it on the source data and explain what it allows to decide in this training organization.
SQL Essentials
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List active categories — a training organization · training scenario is part of the complete programme: 38 lessons, 62 verifiable exercises and 8 published guided projects.
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