How to write the SQL queries for the following questions?
Here is the internal transfer history for
member_id Group_name time_start
1001 Stock 01/05/2018
1001 Quant 06/01/2018
1001 Bond 03/28/2019
1002 Equity 10/08/2016
1. count employees who ever moved from Stock to Bond?
2. count employees who directly moved from Stock to Bond? (Stock -- Quant-- Bond doesn't count)
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