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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Use NOLOCK hint when calling table valued function

Suppose the following function: CREATE FUNCTION [dbo].[ufnTest]() RETURNS TABLE AS RETURN SELECT 1 AS Nr My actual function will select actual data from many different tables. I (mostly) understand ...
0
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1answer
36 views

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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1answer
384 views

Postgres : Executing SELECT within a transaction does not return most recent rows

Given a table layout that looks like this inv_items ========= * id bigserial sku character varying(22) name character varying(32) ... inv_items_stock =============== item_id bigint (inv_items) qty ...
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5answers
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Performance tuning a Great Circle distance calculation

I have a query that I am using to find locations that are within 1km of a known point. To do this, I am using the Spherical Law of Cosines formula with my latitude and longitudes. Currently, the ...
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0answers
86 views

Slow search times with functions despite index?

I'm aware that this question might be under the guidelines of being closed, but I'm out of ideas at the moment on how to optemize this table any further. Given a have a few billion records with ...
3
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1answer
187 views

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 ...
0
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1answer
82 views

Postgresql Function Trying to Insert into 1 row instead of 2

Postgresql 9.3, Mac OS X 10.6.7 I created this function and I would like to insert both results into the same row. Obviously the way I have it inserts into 2 rows. First, here is the Table T1: ...
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2answers
2k views

Function execute query, manipulates result and then return the same result

I need a function that does something like this pseudocode: function get_data() RETURN SET OF something... as BEGIN myResultSet = select id, some_other_column from ...... limit 20000; update ...
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votes
3answers
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how to create backup for stored procedure,trigger and functions of a database in sql server 2008?

I'm having 2 databases in 2 different servers(.246 and .252). I need to create backup for all stored procedures, triggers and function from 252 server and restore it in 246 server.database name in ...
0
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1answer
143 views

Can queries containing deterministic user defined functions be cached in mysql query cache?

According to the mysql 5.6 docs: A query also is not cached under these conditions: ... It refers to user-defined functions (UDFs) or stored functions. However, I have seen claims that if ...
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2answers
1k views

Remove a period if it is the first character in a varchar column

I am migrating data from an old system into a new system I am building and have found someone is doing a bad practice of adding a period to the start of some people's names to make them appear first ...
0
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1answer
131 views

Restricting Insert and Update to functions

We have a function in postgresql that inserts some rows in a table and updates some other rows based on an input provided by the user. Is it possible to somehow execute the function without giving ...
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1answer
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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 ...
3
votes
1answer
211 views

How to create function(table_name) that returns a set of the table

I have a set of tables that share the same fields (some timestamps and users names used for version control). I need to create a function with dynamic sql that uses a table_name and a timestamp as ...
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2answers
329 views

Latitude and Longtitude Distance Calculation [closed]

I'm using MySQL and I am trying to calculate the distance in meters between two different longitude, latitude coordinates. I wrote a stored function in MySQL but it calculates just 1 for each row in ...
2
votes
1answer
450 views

Getting Visual Studio to deploy a UDF to Return NVARCHAR(MAX)

I have a SQLCLR stored procedure with the following signature in Visual Studio 2013: [SqlFunction(DataAccess = DataAccessKind.Read, SystemDataAccess = SystemDataAccessKind.Read)] public static ...
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1answer
1k views

how to correctly return values from a function

I would like to create a function that queries a user table by passing a username and a password, the function is supposed to return 'Y' if the username / password are correct and 'N' if they're not. ...
2
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0answers
2k views

How to use the result of regexp_split_to_array() in stored procedure [closed]

I'm trying to write a function used by an trigger BEFORE INSERT on a table; the function should convert a raw GPS string to useable columns in a different table. The point where I get stuck is the ...
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2answers
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Is this temp table behaviour documented?

Query Language (SQL) and PL/pgSQL functions treat temp tables differently: begin; create table foo(id) as values (1); select * from foo; /* id ---- 1 */ savepoint s; create function f() returns ...
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2answers
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Datediff() in MySQL

While calculating difference between 2 dates as number days, by using MySQL Datediff() function, I am facing some issue, the SQL code is given below. select datediff((select curdate()), (select ...
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1answer
403 views

Function quote_nullable(timestamp without time zone) is not unique

When I run this query on "enterprisedb 9.2", it raises an error: select quote_nullable(to_date('09-02-2014 ','dd-MM-yyyy'))::date; Error: LINE 1: select quote_nullable(to_date('09-02-2014 ','dd-...
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2answers
940 views

Filter by value or show all if no value

I have 2 tables: records and access_rights Access table has list of permission for certain and should be used to filter records based on rules: function field is mandatory object field is optional....
0
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1answer
147 views

What is the MS_PerfDashboard schema in msdb?

We just migrated an old reporting server (running on 2005) to 2012 and some of the database performance monitoring jobs have started failing. I looked into them and found that they use a couple of ...
0
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1answer
660 views

Use string functions and arithmetic calculations in SQL query or by programming language?

I need heavy arithmetic and string functions for processing the data captured from mysql database. Which is preferred: mysql functions or programming language (e.g., PHP)? $result = $mysqli->query(...
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3answers
140 views

How to map similar camelcased, pascalcased, underscored, lowerscored words to the same id?

I'm working on PostgreSQL and I have a table like this called words_table: I need all equivalent words (like software_design and software-design) to have its map value = to its word's equivalent ...
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2answers
953 views

Optimize queries from MySQL SP/Triggers/Functions

I have to investigate a MySQL Production server,While investigating I found a DELETE query in "SHOW PROCESSLIST" which was taking more than 400 second in preparing state, I tried to find the query in ...
0
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1answer
136 views

How to add up a column depending on data from another column

I have a table which has results and a table that has band_name and band_id. Now I need to create a query which will add up the total points for each band and display the band name and ID, so far I ...
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249 views

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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2answers
3k views

Call multiple functions from trigger?

I run PostgreSQL-9.2.4 Is it possible to call 2 functions from a trigger? Let's say I have two functions for two different tables to be executed if following trigger fires: Trigger: CREATE TRIGGER ...
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1answer
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Calling another function inside a postgres function

I have a function A and function B. Function A Name is f_a() and the code is: Select id,address from A; Function B Name is f_b() code is: Select C.address,B.name From (Select id,name from B, (...
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votes
1answer
18k views

Postgres function assign query results to multiple variables

I need to assign values to 2 variable as below in Postgres function. a := select col1 from tbl where ... b := select col2 from tbl where ... How can I assign 2 values to 2 variables in one line ...
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3answers
847 views

Proper use of database functions for business logic

I have a database in postgres with 147 tables; these tables contain data generated by functions that have most of the logic of the system, for example how to build an accounting entry. These ...
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1answer
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Automatic conversion of anonymous records returned from an UDF to well known table-type

Proprietary code (that we cannot change) has a bunch of user defined functions of the type: create or replace function f() returns record as $$ ... $$ which we call in the following way (for ...
2
votes
2answers
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Insert values from a record variable into a table

I am developing a user-defined function that takes two arguments: create or replace function gesio( events_table_in regclass, events_table_out regclass) returns void as $$ ... $$ ...
3
votes
1answer
3k views

Table-valued function runs fast, but slow from another function [closed]

Disclaimer: I'm a senior sysadmin who's trying to help our development team speed up the production database. Our users are hurting, bad. Please don't shoot me for not being great with SQL The ...
3
votes
2answers
4k views

Why cannot I call a table function in iSeries DB2 that I just created?

Using iSeries Navigator 'Run an sql script' window I created a new table function. When I go to the Functions branch under the schema where it was created, I see the function among the other few. But ...
3
votes
1answer
285 views

PL/pgSQL functions and optimizations fences?

I am newbie on DB stuff. And my DB knowledge is very old (around MSSQL2000). All what I remember is, the stored procedures are faster than ordinary queries because it avoid query compilation and ...
0
votes
1answer
399 views

use function arguments or variable in postgres function

I want to set the default value for the column building and floor in my table points in the below function called test(b,f) Create or replace function test(b text, f text) returns void as $$ Begin ...
5
votes
1answer
2k views

MySQL possibility to create global routines (stored procedures and/or functions)

Is it possible to somehow define globally available routines? It seems like every routine must be created in a scope of the database. When I tried to create a routine from console (without prior ...
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2answers
113 views

Optimizing UDF - Is Using DUAL Expensive

I am new to Oracle technology (primarily versed in SQL Server) and I am having trouble with the performance of a UDF. The purpose of the UDF is to take some inputs for an "event", and look up an "...
14
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1answer
5k views

SQL injection in Postgres functions vs prepared queries

In Postgres, are prepared queries and user defined functions equivalent as a mechanism for guarding against SQL injection? Are there particular advantages in one approach over the other?
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2answers
1k views

Recursive update for tree structure in PostgreSQL

I have the following structure of table. id chNum parentid --- ------ --------- 1 1 NULL 2 1.1 1 3 1.1.1 2 4 2 ...
0
votes
1answer
296 views

Selecting from a function that returns a sys refcursor or an alternative

I have a query that returns a resultset of three columns, namely SSN,PAID_YEAR and PAID_TOTAL. From this query I can: Create a view and then query it. Create a function and return resultset If I ...
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0answers
100 views

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 ...
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1answer
8k views

Dynamic SQL is not allowed error for creating function in MySQL

According to this question and answer of Angelo I create a MySQL function as below: DELIMITER $$ CREATE FUNCTION hierarchy_connect_by_parent_eq_prior_id(value INT, reqdTable VARCHAR(50)) RETURNS INT ...
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0answers
180 views

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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Reducing size of image returned by view

We are storing a list of images in a table in an image column. These are stored as their raw image size so they can be viewed in their details at full resolution. The problem I have is I want to show ...
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0answers
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MariaDB CUstom Functions

In MySQL, I wrote functions in C++, compiled them as .so, and added them to MySQL. I am trying to find a website that shows an example for doing the same in MariaDB. I cannot find any instructions, ...
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How to call an Oracle Function with multi out Parameters though LINKSERVER

I need help as I am facing this problem. when I pass 2 output parameter to a function through a linked server I am getting this error. For 1 out parameter its working fine but when I use two output ...
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1answer
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Running functions in parallel

This is for SQL Server 2012. We have some import processes for FTP files that are picked up and read into a staging table, from there we massage/check the data before moving into production. One of ...