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Map of this topic: 1:59 - application preparation 2:45 - creating a MySQL test table 3:16 - preparing test data via a MySQL procedure 5:53 - a remark about script execution time 7:56 - the beginning of practical examples. A bad way. 15:40 - improving the selection. We perform the selection in iterations 20:30 - about generators and separation of code responsibilities 28:17 - summing up I will be glad to receive support: like, comment (adequate criticism is also welcome), money - everything motivates in the plus. https://www.donationalerts.com/r/andr... - wallet.