Fast Lane: Just download attached files, self explanatory.
Easter Sunday, kids asleep, now daddy gets to play. I decided (month ago) to port my code for calculating Easter Sunday to Hana,
for fun of it and to test CTE and UDFs on Hana .
It was not as easy as I thought it would be. My Hana SPS09 rev93.
I had to abandon idea of using CTE's and connected to that my old MS SQL code.
It was said CTE's should work, although not official yet, but I was not able to stumble upon syntax to make it work.
When I gave up, kids were asleep no more, so night shift was ahead.
I had my diskette with Clipper Summer'87 Easter calc code, but no floppy in laptop :smile:
So I googled and found nice simple algorithm, not elegant but now I did not care any more :smile:
http://aa.usno.navy.mil/faq/docs/easter.php
Logical place to do calculation in was scalar UDF.
Then I learned that it does not support SQL statements
Should I use procedure ? Honestly, I would rather not do it at all then use procedure for such a thing.
Finnaly I just made it work, it was to late to post it (not easter Sunday any more), so I postponed posting it and added function for Orthodox Easter calculation using Meeus Julian Algorithm
http://en.wikipedia.org/wiki/Computus
It can be written differently, optimized, part of the code merged, with more variables, or less…certanly better documented :smile: , but here it is as it is, code attached in files also.
Gregorian Catholic Easter Calculation
Gregorian Ortodox Easter Calculation
Good Friday
is then peace of cake
select ADD_DAYS(get_easter_for_year(2015), - 2) AS "GoodFriday" from dummy ;
Easter Monday
in Croatia and some other countries is non working day so:
select ADD_DAYS(get_easter_for_year(2015), 1) AS "EasterMonday" from dummy ;
I also learned that now if I select a code in SQL editor and execute that it worked (just like in MS SQL SMS ).
Before it was not and entire script got executed as I recall. I missed that. Great then.
I've also lerned that in Hana integer divisions do not work like in MS SQL, so
select 3/2 "myInt" from dummy;
is not 1 but 1.5
as opose to
select 3/2 "myInt" in MS SQL
Taking care of that I had to use FLOOR or CAST as INT.
I picked CAST.
So there You go, fun is over.
Any corrections are wellcomed.
Happy Easter !
Bluesky
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