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Mar 7, 2017 at 12:07 history tweeted twitter.com/StackDBAs/status/839085002818191360
Mar 6, 2017 at 11:28 vote accept Matjaž
Mar 6, 2017 at 11:03 comment added Matjaž I know, it was just an example. The idea behind it is to avoid overlapping ranges and the usage of the ranges instead of two columns is meant to compensate the multiple UNIQUE contraints and triggers to check the overlapping.
Mar 6, 2017 at 10:51 answer added ypercubeᵀᴹ timeline score: 7
Mar 6, 2017 at 10:04 comment added ypercubeᵀᴹ You know that these 2 designs are not equivalent. Did you mean to have UNIQUE constraints on both first_session and last_session?
Mar 6, 2017 at 9:55 history asked Matjaž CC BY-SA 3.0