Question: Given a Table Act_Group with the first column being StartTime and its datatype, TIMESTAMP. Firstly, write the SQL to ensure a group does not start

Given a Table Act_Group with the first column being StartTime and its datatype, TIMESTAMP. Firstly, write the SQL to ensure a group does not start multiple concerts at the same. Secondly, then allow groups to be able to perform multiple times at the same concert (e.g., a first half, then an interval, then a second half).

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