Recent Content by wingstech

  1. wingstech
    Thread

    Find the key for a weak entity

    Hi: I had posted an ER diagram (see the attachment file er.jpg). In the diagram, there is a weak entity VISITS which is on the right side of...
    Thread by: wingstech, May 16, 2006, 0 replies, in forum: Databases
  2. wingstech
    Post

    GROUP BY hepe!

    Thanks. It still does not work. The value of COUNT(*) for department 2 should be 0. But it is 1 in results. Can you fix this error? The followings...
    Post by: wingstech, Apr 4, 2006 in forum: Databases
  3. wingstech
    Post

    GROUP BY hepe!

    It does not work. The deparment 2 still not show up in the results.
    Post by: wingstech, Apr 3, 2006 in forum: Databases
  4. wingstech
    Thread

    GROUP BY hepe!

    I have a problem which is "For each department, find the department number and the number of employees of the department. It does not matter...
    Thread by: wingstech, Apr 3, 2006, 5 replies, in forum: Databases
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    wingstech

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