A function performs some specified work, usually taking parameters as input. In terms of databases these may be specific to SQL or to the database vendor.

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How to create a function(table_name) that return a collection in Oracle?

I need to create a function in Oracle that accepts a table name and return a collection the content of which is based the table that accepted. I've been doing some search, many examples are of the ...
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Tree structure hierarchical query sorting

I have the following structure of table. CREATE TABLE table1 ( serial_num integer NOT NULL, parent_num integer, parent_key text, key_ary_num integer[], level integer, rank integer, ...
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Mysql functions for web apps

I have few questions about using functions in a MySQL database for plugins and extensions of web apps like Magento or Wordpress. Mostly this is for a few extensions I want to do for Magento. The ...
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Is there a First() aggregate function in postgresql that returns the exact same type as the input?

Full question re-write I'm looking a First() aggregate function. Here I found something that almost works: CREATE OR REPLACE FUNCTION public.first_agg ( anyelement, anyelement ) RETURNS anyelement ...
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PLSQL using cursors or functions to query repeated data

Is it better to declare a commonly used lookup query as a package function or as a function (either returning rows or values or returning a sysref cursor)? Whats the difference? What are the best ...
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Cumulative Function in MySQL

i have a problem creating cumulative function in mysql database. let say i have a stored procedure which getting data and counting quantity/sum_quantity example A table consist of consumer goods ...
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Inline TVF with One Row Result

I have several times converted scalar functions into inline tvf. Usually this is the basic design I used in inline tvf: CREATE FUNCTION TVF(@ID INT) RETURNS TABLE AS RETURN( WITH BASE AS( ...
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Calling a function in remote database inside a stored procedure

There are 2 Oracle databases with pseudo names Remote and Local. I have a function in Remote called FUS.F_Return_10 which simply returns 10 for testing purposes, where FUS is a schema name. In Local I ...
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stored procedure returns ERROR 1305 (42000): FUNCTION does not exist

I have a stored procedure and function as below CREATE PROCEDURE ProcName() begin .... DECLARE curs CURSOR FOR select A.PList, B.nid from persons A inner join articles B on A.aid=B.id; .... ...
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Performance decline function vs command window

I have a function that I first wrote as a serious of commands. In the SQL command window when executed, those steps take about 8 seconds to return the data set. When those same commands are turned ...
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postgres: access to schema objects within a function

Here's my problem: I have Schema A, owned by User 1, that owns all objects. I've created schema B, owned by User 2. I have granted User 2 all privileges to the objects owned by User 1. When logged ...
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Why would call to scalar function inside a Table Value Function be slower than outside the TVF?

I am writing a Table Value Function, calling the function takes 10x as long as directly running the code. I traced this to a call to a multi-line scalar function inside the TVF. The call to the ...
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Index on fields with a function

I have a log table. It logs visitor data (time of visit, browser, window size ...). I want to create reports. I use a query like this (MySQL): SELECT COUNT(*) as raw_views ... FROM logs WHERE ...
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Function performance issue

This one is puzzling me since yesterday and maybe someone could shed some light on this. We've got this table that records GPS data. We're currently doing some overloading tests to see how the ...
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Informix error 674: Routine (gc_init) can not be resolved.

I have created function in Informix like this. Now I want to drop that function. I have successfully dropped auxiliary functions e.g. DROP FUNCTION gc_init(VARCHAR(255)) When I try to drop ...
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Convert this Ruby function into MySQL Function?

From my answer at SO, I have the following function: def rgb_to_hue(r,g,b) # normalize r, g and b r_ = r / 255.0 g_ = g / 255.0 b_ = b / 255.0 c_min = [r_,g_,b_].min c_max = ...
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Postgresql function taking long time on newly restored database

I have developed one function in my PostgreSQL database. It was taking 12-15 seconds to execute. Now I have restored a new PostgreSQL 9.0 dump using following command: pg_restore -hx.x.x.x -p5432 -d ...