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Getting Largest Row Number
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Kassi Hill
Greenhorn
Joined: Sep 29, 2003
Posts: 24
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I need to write an SQL statement to get the Largest number out of an Access database table. I know it sounds simple but when I try "SELECT MAX (Question.qID) FROM Question"; this does not work, it says "Column Count not Found". If I run the query in Access then it works but I need to be able to get this number in JAVA so that I can then add one to it for a new id number. When I try just listing the id numbers in the table it works but when I add the MAX to the query I get an error. Thank you for your help!! I have been trying something like: private int getNewQID(){ int qID = 0; String sql3 = "SELECT Max(Question.qID) FROM Question"; try{ rs = dataAccess.runSelectQuery(sql3); while (rs.next()){ qID = (rs.getInt("qID")); qID = qID +1; System.out.println(qID); } }catch(Exception sqle) { System.err.println("SQL NOT Executed: " + sqle); } return qID; }
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Jeanne Boyarsky
internet detective
Marshal
Joined: May 26, 2003
Posts: 26489
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The column name you are looking for probably idn't called qID. I don't know what name Access uses as a default for aggregate functions, but it's probably not something you want to code into your application. You have two options for solving the problem: 1) Explicitly name the column in your select statement. "SELECT MAX (Question.qID) as "qID" FROM Question" 2) Use the column number: rs.getInt(1);
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subject: Getting Largest Row Number
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