SQL Essentials · GROUP BY · SUM
Compare value by city — a regional bookstore · training scenario
Compare the value by city in the context of a regional bookstore, with a controllable result. You must produce the result, check it on the source data and explain what it allows you to decide in this network of bookstores.
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Compare value by city — a regional bookstore · training scenario is part of the complete programme: 38 lessons, 62 verifiable exercises and 8 published guided projects.
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