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subquery using IN clause

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[愿得一人]
[愿得一人] 2021-01-15 06:02 
----------
User
----------
user_ID(pk)
UserEmail

----------
Employer1
----------
Emp1ID(pk)
Emp1NO

----------
Employer2
----------
Emp2ID(pk)
Emp2NO

----------
Pr
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  • 灰色年华
    灰色年华 (楼主)
    2021-01-15 06:52

    I would recommend not using the IN statement. Use EXISTS instead.

    http://www.techonthenet.com/sql/exists.php

    Example #1

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