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Recent content by alapatis

  1. alapatis

    SQL query for duplicate value in one table

    SELECT firstname,age FROM empinfo GROUP BY age HAVING (COUNT(age) > 1)
  2. alapatis

    why can't I do this?

    plz try this.. SELECT COURSENUM,COUNT(*) AS NumberOfScience FROM Enrolls WHERE COURSENUM = 605;
  3. alapatis

    sql newb - creating tables

    u can use alter table command to set primary key to Cust_id iff the field has no duplicate data
  4. alapatis

    Table intersection?

    u had 3 join attributes... u should write an inner join for all these 3 colums... if u have primary key in 1 table and forign key in another table...u can simply applyinner join on key column only.
  5. alapatis

    Question about a query

    select Num from table where Num = (select ID from Num where Num = 0 ) in this case the sub query should result a single ID.(according to query) select ID from table where Num IN (select ID from table where Num = 0 ) in this case the sub query should result multiple IDs. (So it works fine)
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