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Question

How to write the SQL queries for the following questions?

Here is the internal transfer history for

employees.

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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