Aggregate UDF [CORE1326]

firebird-automations commented 17 years ago

Submitted by: Igor Lobov (ivl)

Is duplicated by CORE3162

Votes: 9

Create a way to create aggregate UDFs

firebird-automations commented 16 years ago

Modified by: @pcisar

Workflow: jira \[ 12350 \] =\> Firebird \[ 14884 \]

firebird-automations commented 15 years ago

Commented by: Ivan (patuljak)

mysql support this and maybe other databases.

http://books.google.com/books?id=kVB1wiF87ooC&pg=PA265&lpg=PA265&dq=mysql+udf+aggregate+example&source=bl&ots=HOlP34LbdM&sig=Fcj_7w5NycrtKhxpUbAREpMQ5K0&hl=en&ei=saTdSub8OIGUjAe838xt&sa=X&oi=book_result&ct=result&resnum=5&ved=0CBkQ6AEwBA#v=onepage&q=mysql%20udf%20aggregate%20example&f=false

why is this important?

if I need functions which contains few aggregate function then the best way for this problem is aggregate UDF.

firebird c-api does not support this and I don't know why?

many special functions which people need can't be write in sql query. can be but with two or more stored procedures.

for example consider standard deviation

http://en.wikipedia.org/wiki/Standard_deviation

first query is avg(x) on stored procedures. input parameter is one column-> x. then must using cursor and for each x calculate (x-avg(x))^2 as y

then must run query sqrt(sum(y)/count(x))

I know that somebody will say that database is not for processing data.

cursor is very slow, ETL (SISS) is fast but for processing data is slow. ETL(SISS) is only for transform and migrate data.

application for statistics is also not very good.

what users want is only enable aggregate UDF in c-api and nothing else.

firebird-automations commented 15 years ago

Modified by: @asfernandes

assignee: Adriano dos Santos Fernandes \[ asfernandes \]

firebird-automations commented 14 years ago

Modified by: @asfernandes

Link: This issue is duplicated by [CORE3162](https://github.com/FirebirdSQL/firebird/issues?q=CORE3162+in%3Atitle) \[ [CORE3162](https://github.com/FirebirdSQL/firebird/issues?q=CORE3162+in%3Atitle) \]

firebird-automations commented 14 years ago

Modified by: Ivan (patuljak)

Link: This issue is duplicated by [CORE3163](https://github.com/FirebirdSQL/firebird/issues?q=CORE3163+in%3Atitle) \[ [CORE3163](https://github.com/FirebirdSQL/firebird/issues?q=CORE3163+in%3Atitle) \]

firebird-automations commented 14 years ago

Modified by: @dyemanov

Link: This issue is duplicated by [CORE3163](https://github.com/FirebirdSQL/firebird/issues?q=CORE3163+in%3Atitle) \[ [CORE3163](https://github.com/FirebirdSQL/firebird/issues?q=CORE3163+in%3Atitle) \] =\>

firebird-automations commented 13 years ago

Commented by: adnanoncevarlik (adnanoncevarlik)

Hi All,

May be wrong place to say but we want to create functions on FIREBIRD and want to use in SELECT statements. Like this,

CREATE MY_FUNC_CALC_AGE(prmBirthDay TIMESTAMP) RETURNS RET_AGE INTEGER BEGIN RET_AGE = DATEDIFF(YEAR FROM prmBirthDay TO CURRENT_DATE) ;
SUSPEND ; END

SELECT NAME, SIRNAME, MY_FUNC_CALC_AGE( BIRTHDAY) FROM MY_TABLE

When this issue will planned to solve ?

Thank you and best regards Adnan

firebird-automations commented 13 years ago

Commented by: @dyemanov

It's implemented in FB v3.0.