I want to pass an integer array from input parameters of my postgresql function into sql IN clause.
Into what and how I can convert such array?
I had same problem lately.
Look here:
http://postgresql.1045698.n5.nabble.com/Using-PL-pgSQL-text-argument-in-IN-INT-INT-clause-re-post-td3235644.html
Hope it helps.
Here is a sample function:
CREATE OR REPLACE FUNCTION "GetSetOfObjects"(ids text)
RETURNS SETOF record AS
$BODY$select *
from objects
where id = any(string_to_array($1,',')::integer[]);$BODY$
LANGUAGE sql IMMUTABLE
Basically you can't. What you can do is pass in a comma-delimited list and split it apart in your function. Here are some examples using SQL Server, but I'm sure they can be translated.
Unless this (PostgreSQL) is what you're talking about.
i usually use implicit conversion
select '{1,2,3,4,5}' :: integer[]
Related
I'm attempting to use pg_trgm for string fuzzy matching and I know it may be used like this:
SELECT * FROM artists WHERE SIMILARITY(name, 'Claud Monay') > 0.4;
where a scalar value may be used to compare against the similarity. However, I've seen this way of using SIMILARITY with an array of strings:
SELECT * FROM artists WHERE 'Cadinsky' % ANY(STRING_TO_ARRAY(name, ' '));
which uses the % operator which is a shorthand for comparing against the default value of 0.3. I'm trying to find the proper syntax to use ANY(STRING_TO_ARRAY(...)) but with the first form where an arbitrary scalar value may be given to compare the similarity against.
This is, most likely, just a simple question of properly using the syntax for ANY, but I'm failing at understanding what the correct form is.
There is no syntax to use ANY with 3 arguments (the string, the array of strings, and the similarity threshold). The way to do it is to set pg_trgm.similarity_threshold to the value you want rather than the default of 0.3, and then use % ANY.
If you want to use different thresholds in different parts of the query, you are out of luck with the ANY construct.
You can always define your own function, but you will probably not be able to get it to use an index.
create or replace function most_similar(text, text[]) returns double precision
language sql as $$
select max(similarity($1,x)) from unnest($2) f(x)
$$;
SELECT * FROM artists WHERE most_similar('Cadinsky', STRING_TO_ARRAY(name, ' '))>0.4;
I am not a DB expert nor good at SQL but here is my solution.
I basically use a function called unnest(). Thus, I can iterate over the array and check the similarity value for each item then compare it to similarity input, which is a float.
Using something like set pg_trgm.similarity_threshold=0.6; is a global setting as far as I know. The question is specifically asking for an explicit threshold.
Also, if you create a function to do the job and the function is not VOLATILE but is STABLE, you cannot use set pg_trgm.similarity_threshold. (At least that was what happened to me).
Caution: I didn't compare my approach to (ANY) approach in terms of performance.
Example Code:
CREATE OR REPLACE FUNCTION your_function_name (input text, similarity float) RETURNS
SELECT * FROM your_table_name
WHERE EXISTS
(SELECT
FROM unnest(ARRAY['item','anotherItem', 'third-ish']) element
WHERE SIMILARITY (input, element) > similarity
);
$ function $
I'm new to Redshift and I stumbled across a scenario wherein my procedure, I wanted to split a string and iterate it through and do some manipulations in it. I know redshift doesn't support arrays and I want to know how to achieve this in redshift
CREATE OR REPLACE PROCEDURE example(value IN varchar) AS $$
BEGIN
--value = 'FIRST, SECOND, THIRD' -> I want to split the string using a comma and iterate through one by one and do some manipulations.
END;
$$ LANGUAGE plpgsql;
Can Someone guide me through it?
Thanks in Advance,
You could create a loop of incrementing values, and call SPLIT_PART(), passing in the loop value.
If part is larger than the number of string portions, SPLIT_PART returns an empty string.
Therefore, you would stop the loop if an empty string is returned.
In essence, I'd like the ability to create a scalar function which accepts a variable number of parameters and concatenates them together to return a single VARCHAR. In other words, I want the ability to create a fold over an uncertain number of variables and return the result of the fold as a VARCHAR, similar to .Aggregate in C# or Concatenate in Common Lisp.
My (procedural) pseudo code for such a function is as follows:
define a VARCHAR variable
foreach non-null parameter convert it to a VARCHAR and add it to the VARCHAR variable
return the VARCHAR variable as the result of the function
Is there an idiomatic way to do something like this in MS-SQL? Does MS-SQL Server have anything similar to the C# params/Common Lisp &rest keyword?
-- EDIT --
Is it possible to do something similar to this without using table-valued parameters, so that a call to the function could look like:
MY_SCALAR_FUNC('A', NULL, 'C', 1)
instead of having to go through the rigmarole of setting up and inserting into a new temporary table each time the function is called?
For a set of items, you could consider passing a table of values to your function?
Pass table as parameter into sql server UDF
See also http://technet.microsoft.com/en-us/library/ms191165(v=sql.105).aspx
To answer your question directly, no, there is no equivalent to the params keyword. The approach I'd use is the one above - Create a user-defined table type, populate that one row per value, and pass that to your scalar function to operate on.
EDIT: If you want to avoid table parameters, and are on SQL 2012, look at the CONCAT function:
http://technet.microsoft.com/en-us/library/hh231515.aspx
CONCAT ( string_value1, string_value2 [, string_valueN ] )
This is only for the built-in CONCAT function, you couldn't roll-your-own function with "params" style declaration.
I am using postgres with postgis and i have a table with geometry data. Now i would like to write a procedure in plpgsql that loop through the rows and store each geometry value in array.
What return typeshall i use to return an array full of geometry values?
Why not to use geometry[] type?
EDIT
You can use any of the existing PostgreSQL types for arrays, per documentation:
Arrays of any built-in or user-defined base type, enum type, or
composite type can be created.
Oracle has a function called translate that can be used to replace individual characters of the string by others, in the same order that they appear. It is different than the replace function, which replaces the entire second argument occurence by the entire third argument.
translate('1tech23', '123', '456'); --would return '4tech56'
translate('222tech', '2ec', '3it'); --would return '333tith'
I need this to implement a search on a SQLite database ignoring accents (brazilian portuguese language) on my query string. The data in the table that will be queried could be with or without accents, so, depending on how the user type the query string, the results would be different.
Example:
Searching for "maçã", the user could type "maca", "maça", "macã" or "maçã", and the data in the table could also be in one of the four possibilities.
Using oracle, I would only use this:
Select Name, Id
From Fruits
Where Translate(Name, 'ãç','ac') = Translate(:QueryString, 'ãç','ac')
... and these other character substitutions:
áéíóúÁÉÍÓÚàèìòùÀÈÌÒÙãõÃÕäëïöüÄËÏÖÜâêîôûÂÊÎÔÛñÑçÇ
by:
aeiouAEIOUaeiouAEIOUaoAOaeiouAEIOUaeiouAEIOUnNcC
Of course I could nest several calls to Replace, but this wouldn't be a good choice.
Thanks in advance by some help.
Open-source Oracle functions for SQLite have been written at Kansas State University. They include translate() (full UTF-8 support, by the way) and can be found here.
I don't believe there is anything in sqlite that will translate text in a single pass as you describe.
This wouldn't be difficult to implement as a user defined function however. Here is a decent starting reference.
I used replace
REPLACE(string,pattern,replacement)
https://www.sqlitetutorial.net/sqlite-replace-function/