Return NULL on no found rows

Hi all

I need to return "Null" If no line is detected. My setup is as below:

I need to find the last date of a series of dates < input date remains the date of entry.

For example

Case 1 - list of dates:

12 - Feb
15 - Feb
18 - Feb
12 - Mar
15 - Mar

Date of entry of the user: 1 March

Released: 18 Feb.

This can be resolved by the SQL

SELECT MAX (ACTION_DT) START_DATE IN DATE_TABLE WHERE ACTION_DT < TO_DATE('01-Mar-2010')

Case 1 - list of dates:


12 - Mar
15 - Mar

Date of entry of the user: 1 March

The SQL above returns no rows. But I need to return the Null value so that I can use NVL or some otherway to get the result as 1-Mar.


If someone can throw in ideas, it would be great. (I know the use of County, but I'm looking for something that might be less complex)

Thank you
Priscilla.

Hello
Maybe you're looking code like this:

SELECT ID, Min (CASE WHEN your_Date< date="" '2010-05-13'="" then="" your_date="" else="" null="">
FROM YOUR_TABLE
GROUP BY ID

MI

Tags: Database

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    I have this ics. SQL statement that returns an IList as null and nothing in the errStr in debugging print.

    IList rsATypes is ics. SQL (, sqlATypes, listName, limit, bCache errStr);

    The code is in one of my jsp. He ran very well in my local JSK (HyperSQL Db), but returns NULL in the case of Test (Oracle DB, if this is another).

    I got the sql statement println during execution and run it directly in Oracle DB (same instance) it returns the expected result set.

    The code snippet:

      System.out.println("## ics.GetSSVar(\"pubid\")          : " + ics.GetSSVar("pubid"));
    
        // Get Attribute Types
        String sqlATypes = "SELECT DISTINCT assetpublication.assettype "
                         + "FROM assetpublication "
                         + "LEFT JOIN approvedassets "
                         + "    ON assetpublication.assetid = approvedassets.assetid "
                         + "WHERE pubid = '" + ics.GetSSVar("pubid") + "' "
                         + "AND (tstate is null OR tstate <> 'A') "
                         + "AND (voided is null OR voided <> 'T') "
                         + "ORDER BY assettype; ";
        System.out.println("##0126 sqlATypes : " + sqlATypes);
        String from = "AssetPublication, ApprovedAssets";
        // String listName = null;
        String listName = "ATypesList";
        int limit = -1;
        // boolean bCache = true;
        boolean bCache = false;
        StringBuffer errStr = new StringBuffer("");
        ics.ClearErrno();
        IList rsATypes = ics.SQL(from, sqlATypes, listName, limit, bCache, errStr);
    
        System.out.println("## rsATypes : " + rsATypes);
        if (rsATypes == null) {
            System.out.println("## NO DATA in rsATypes! errStr : " + errStr.toString());
    

    }

    The journal:

    ## ics.GetSSVar("pubid")          : 1374097570685
    ## sqlATypes : SELECT DISTINCT assetpublication.assettype FROM assetpublication LEFT JOIN approvedassets     ON assetpublication.assetid = approvedassets.assetid WHERE pubid = '1374097570685' AND (tstate is null OR tstate <> 'A') AND (voided is null OR voided <> 'T') ORDER BY assettype;
    ## rsATypes : null
    ## NO DATA in rsATypes! errStr :
    


    I got enclosing try catch block, who did not take any exception.


    The funny thing is, in the same piece of code, an ics. Casea used already worked (which I noticed outside because there was not enough for what I want to do):

            StringBuffer errSB = new StringBuffer("");
            ics.SetVar("assetid", id);
            IList approvedAsset = ics.SelectTo("ApprovedAssets", "state,voided,tstate,locked,reason,treason", "assetid", null, -1, null, true, errSB);
    

    Any help/ideas from anyone would be really appreciated.

    Thanks Guddu1223, I discovered why.

    The SQL statement cannot end with a semicolon (see line 11 of my original above codes). Delete who had back all the records provided for in my resultset in the IList.

    The reason why it works in my local, but not stable instance that I guess is my local JSK + HyperSQL, in WCS + Oracle DB instance trying...

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