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Classics Forum

DATE master lookup table (1990-01-01:2041-12-31)

Date: Sunday, 11 April 2010, at 12:34 a.m.

I use a DATE's master table for looking up dates and other values in order to control several events, intervals and calculations within my app. It has rows for every single day begining from 01/01/1990 to 12/31/2041. One example of how I use this lookup table is:

1. A customer pawned an item on: JAN-31-2010
2. Customer returns on MAY-03-2010 to make an interest pymt to avoid

forfeiting the item.
3. If he pays 1 months interest, the employee enters a "1" and the app looks-

up the pawn date (JAN-31-2010) in date master table and puts FEB-28-2010

in the applicable interest pymt date. FEB-28 is returned because

FEB-31's dont exist! If 2010 were a leap-year, it would've returned

4. If customer pays 2 months, MAR-31-2010 is returned. 3 months, APR-30...

If customer pays more than 3 months or another period not covered by

by the date lookup table, employee manually enters the applicable date.

Here's what the date lookup table looks like:

CREATE TABLE datemast {Copyright 1990:2010, Frank Computer, Inc.}

{ DBDATE=YMD4- (correctly sorted for faster lookup)}
dm_lookup DATE, {lookup col used for obtaining values below}

dm_workday CHAR(2), {NULL=Normal Working Date,}

{NW=National Holiday(Working Date),}

{NN=National Holiday(Non-Working Date),}

{NH=National Holiday(Half-Day Working Date),}

{CN=Company Proclamated(Non-Working Date),}

{CH=Company Proclamated(Half-Day Working Date)}

{several other columns omitted}

dm_description CHAR(30), {NULL, holiday description or any comments}
dm_day_num SMALLINT, {number of elapsed days since begining of year}
dm_days_left SMALLINT, {number of remaining days until end of year}

dm_plus1_mth DATE, {plus 1 month from lookup date}
dm_plus2_mth DATE, {plus 2 months from lookup date}
dm_plus3_mth DATE, {plus 3 months from lookup date}
dm_fy_begins DATE, {fiscal year begins on for lookup date}
dm_fy_ends DATE, {fiscal year ends on for lookup date}
dm_qtr_begins DATE, {quarter begins on for lookup date}
dm_qtr_ends DATE, {quarter ends on for lookup date}
dm_mth_begins DATE, {month begins on for lookup date}
dm_mth_ends DATE, {month ends on for lookup date}
dm_wk_begins DATE, {week begins on for lookup date}
dm_wk_ends DATE, {week ends on for lookup date}

{several other columns omitted}


Can you think of an easier way to do this or is it a cool method?

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