Re: SQL Date field storage versus PF DDS storage

Paul and Vern:

CORRECTION:  I don't know what the internal format is -- you can run e.g.:
    select datfld, hex(datfld) from yourtable
to see for yourself ...
Mark

On Monday, March 25, 2019, 12:02:14 PM EDT, Vernon Hamberg <vhamberg@xxxxxxxxxxxxxxx> wrote:

To add to confusion or clarity - not sure - the SQL catalog SYSCOLUMNS
has the actual storage length -

select * from syscolumns where table_name = 'your-table-with-date-column';

You'll see something different.

I though I've seen this information gathered together somewhere - maybe
DBU - maybe one of the IBM i services.

HTH
Vern

On 3/25/2019 10:12 AM, Mark Waterbury wrote:

  Paul,
Date fields in Db2i have always occupied 4 bytes internally. When the date field is materialized by the database, it is converted from its internal binary form to and appears as 10 decimal character (zoned decimal) positions.
This is true whether a database file is defined by DDS using e.g. CRTPF or a table is defined via SQL DDL.
Hope that helps,
Mark S. Waterbury

      On Monday, March 25, 2019, 11:08:44 AM EDT, Therrien, Paul via MIDRANGE-L <midrange-l@xxxxxxxxxxxxxxxxxx> wrote:
 
  This may not be too important, but seems to be an anachronism.

I have a table that is built with SQL DDL and one of the fields is a date field defined as:
PIPRJSDT      DATE      NOT NULL DEFAULT CURRENT_DATE;

When I Interrogate the file with DSPFFD I see the date field as taking 10 positions:

                        Data        Field      Buffer  Buffer          Field      Column
  Field          Type      Length  Length  Position        Usage    Heading
  PIPRJSDT  DATE          10      10            63                  Both      Project
                                                                                                                  Ship
                                                                                                                  Date
    Field text  . . . . . . . . . . . . . . . :  Projected ship date
    Date Format . . . . . . . . . . . . . . . :  *ISO
    Default value . . . . . . . . . . . . . . :
        CURRENT_DATE
    Coded Character Set Identifier  . . . . . :    37

When I interrogate the field using the SYSCOLUMNS I see this:
Column_Name Data Type    Length  Storage
PIPRJSDT        DATE                  4                4

I suppose this is expected, but I wasn't expecting this.

I found this while trying to generate a file layout using SYSCOLUMNS to excel and was trying to create a file layout listing column starting positions.


Paul

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