I have one major select list in a program
EXECUTE 'SELECT PRODUCTS WITH DEL.DATE <= "':EOM.DATE;'"' CAPTURING OUTPUT
I then want to covert the select list to an array, is there a Universe basic function to do this or do I need to write a function?
Use READLIST to read the contents of your active select list into a field delimited (#FM) dynamic array. This is a paradigm I employ when working with multiple select lists and the payloads aren't too large. You can also select into a different list other than the default of 0 but that gets a bit messy intellectually.
EXECUTE 'SELECT PRODUCTS WITH DEL.DATE <= "':EOM.DATE;'"' CAPTURING OUTPUT
READLIST PRODUCTS.LIST ELSE PRODUCTS.LIST = ''
PRODUCTS.COUNT = DCOUNT(PRODUCTS.LIST,#FM)
FOR X=1 TO PRODUCTS.COUNT
ID.PRODUCTS = PRODUCTS.LIST<X>
;* Your per ID magic goes here
NEXT X
Good luck!
Related
I have an array of strings, some of which may be repeated. I am trying to build a query which returns a single json object where the keys are the distinct values in the array, and the values are the count of times each value appears in the array.
I have built the following query;
WITH items (item) as (SELECT UNNEST(ARRAY['a','b','c','a','a','a','c']))
SELECT json_object_agg(distinct_values, counts) item_counts
FROM (
SELECT
sub2.distinct_values,
count(items.item) counts
FROM (
SELECT DISTINCT items.item AS distinct_values
FROM items
) sub2
JOIN items ON items.item = sub2.distinct_values
GROUP BY sub2.distinct_values, items.item
) sub1
DbFiddle
Which provides the result I'm looking for: { "a" : 4, "b" : 1, "c" : 2 }
However, it feels like there's probably a better / more elegant / less verbose way of achieving the same thing, so I wondered if any one could point me in the right direction.
For context, I would like to use this as part of a bigger more complex query, but I didn't want to complicate the question with irrelevant details. The array of strings is what one column of the query currently returns, and I would like to convert it into this JSON blob. If it's easier and quicker to do it in code then I can, but I wanted to see if there was an easy way to do it in postgres first.
I think a CTE and json_object_agg() is a little bit of a shortcut to get you there?
WITH counter AS (
SELECT UNNEST(ARRAY['a','b','c','a','a','a','c']) AS item, COUNT(*) AS item_count
GROUP BY 1
ORDER BY 1
)
SELECT json_object_agg(item, item_count) FROM counter
Output:
{"a":4,"b":1,"c":2}
SUMMARY: I've two tables I want to derive info out of: family_values (family_name, item_regex) and product_ids (product_id) to be able to update the property family_name in a third.
Here the plan is to grab a json array from the small family_values table and use the column value item_regex to do a test match against the product_id for every row in product_ids.
MORE DETAILS: Importing static data from CSV to table of orders. But, in evaluating cost of goods and market value I'm needing to continuously determine family from a prefix regex (item_regex from family_values) match on the product_id.
On the client this looks like this:
const families = {
FOOBAR: 'Big Ogre',
FOOBA: 'Wood Elf',
FOO: 'Valkyrie'
};
// And to find family, and subsequently COGs and Market Value:
const findFamily = product_id => Object.keys(families).find(f => new RegExp('^' + f).test(product_id));
This is a huge hit for the client so I made a family_values table in PG to include a representative: family_name, item_regex, cogs, market_value.
Then, the product_ids has a list of only the products the app cares about (out of millions). This is actually used with an insert trigger 'on before' to ignore any CSV entries that aren't in the product_ids view. So, I guess after that the product_ids view could be taken out of the equation because the orders, after inserting readonly data, has its own matching product_id. It does NOT have family_name, so I still have the issue of determining that client-side.
PSUEDO CODE: update family column of orders with family_name from family_values regex match against orders.product_id
OR update the product_ids table with a new family column and use that with the existing on insert trigger (used to left pad zeros and normalize data right now). Now I'm thinking this may be just an update as suggested, but not real good with regex in PG. I'm a PG novice.
PROBLEM: But, I'm having a hangup in doing what I thought would be like a JS Array Find operation. The family_values have been sorted on the item_regex so that the most strict match would be on top, and therefor found first.
For example, with sorting we have:
family_values_array = [
{"family_name": "Big Ogre", "item_regex": "FOOBAR"},
{"family_name": "Wood Elf", "item_regex": "FOOBA"},
{"family_name": "Valkyrie", "item_regex": "FOO"}]
So, that the comparison of product_id of ^FOOBA would yield family "Wood Elf".
SOLUTION:
The solution I finally came about using was simply using concat to write out the front-anchored regex. It was so simple in the end. The key line I was missing is:
select * into family_value_row from iol.family_values
where lvl3_id = product_row.lvl3_id and product_row.product_id
like concat(item_regex, '%') limit 1;
Whole function:
create or replace function iol.populate_families () returns void as $$
declare
product_row record;
family_value_row record;
begin
for product_row in
select product_id, lvl3_id from iol.products
loop
-- family_name is what we want after finding the BEST match fr a product_id against item_regex
select * into family_value_row from iol.family_values
where lvl3_id = product_row.lvl3_id and product_row.product_id like concat(item_regex, '%') limit 1;
-- update family_name and value columns
update iol.products set
family_name = family_value_row.family_name,
cog_cents = family_value_row.cog_cents,
market_value_cents = family_value_row.market_value_cents
where product_id = product_row.product_id;
end loop;
end;
$$
LANGUAGE plpgsql;
Use concat as updated above:
select * into family_value_row from iol.family_values
where lvl3_id = product_row.lvl3_id and product_row.product_id
like concat(item_regex, '%') limit 1;
I am trying to create a stored procedure that will split 3 text boxes on a webpage that have user input that all have comma delimited strings in it. We have a field called 'combined_name' in our table that we have to search for first and last name and any known errors or nicknames etc. such as #p1: 'grei,grie' #p2: 'joh,jon,j..' p3: is empty.
The reason for the third box is after I get the basics set up we will have does not contain, starts with, ends with and IS to narrow our results further.
So I am looking to get all records that CONTAINS any combination of those. I originally wrote this in LINQ but it didn't work as you cannot query a list and a dataset. The dataset is too large (1.3 million records) to be put into a list so I have to use a stored procedure which is likely better anyway.
Will I have to use 2 SP, one to split each field and one for the select query or can this be done with one? What function do I use for contains in tsql? I tried using IN win a query but cannot figure out how it works with multiple parameters.
Please note that this will be an internal site that has limited access so worrying about sql injection is not a priority.
I did attempt dynamic SQL but am not getting the correct results back:
CREATE PROCEDURE uspJudgments #fullName nvarchar(100) AS
EXEC('SELECT *
FROM new_judgment_system.dbo.defendants_ALL
WHERE combined_name IN (' + #fullName + ')')
GO
EXEC uspJudgments #fullName = '''grein'', ''grien'''
Even if this did retrieve the correct results how would this be done with 3 parameters?
You may try use this to split string and obtain a tables of strings. Then to have all the combinations you may use full join of these two tables. And then do your select.
Here is the Table valued function I set up:
ALTER FUNCTION [dbo].[Split] (#sep char(1), #s varchar(8000))
RETURNS table
AS
RETURN (
WITH splitter_cte AS (
SELECT CHARINDEX(#sep, #s) as pos, 0 as lastPos
UNION ALL
SELECT CHARINDEX(#sep, #s, pos + 1), pos
FROM splitter_cte
WHERE pos > 0
)
SELECT SUBSTRING(#s, lastPos + 1,
case when pos = 0 then 80000
else pos - lastPos -1 end) as OutputValues
FROM splitter_cte
)
)
I want a query which will return a combination of characters and number
Example:
Table name - emp
Columns required - fname,lname,code
If fname=abc and lname=pqr and the row is very first of the table then result should be code = ap001.
For next row it should be like this:
Fname = efg, lname = rst
Code = er002 and likewise.
I know that we can use substr to retrieve first letter of a colume but I don't know how to use it to do with two columns and how to concatenate.
OK. You know you can use substr function. Now, to concatenate you will need a concatenation operator ||. To get the number of row retrieved by your query, you need the rownum pseudocolumn. Perhaps you will also need to use to_char function to format the number. About all those functions and operators you can read in SQL reference. Anyway I think you need something like this (I didn't check it):
select substr(fname, 1, 1) || substr(lname, 1, 1) || to_char(rownum, 'fm009') code
from emp
I've got a table that resembles the following:
WORD WEIGHT WORDTYPE
a 0.3 common
the 0.3 common
gray 1.2 colors
steeple 2 object
I need to pull the weights for several different words out of the database at once. I could do:
SELECT * FROM word_weight WHERE WORD = 'a' OR WORD = 'steeple' OR WORD='the';
but it feels ugly and the code to generate the query is obnoxious. I'm hoping that there's a way I can do something like (pseudocode):
SELECT * FROM word_weight WHERE WORD = 'a','the';
You are describing the functionality of the in clause.
select * from word_weight where word in ('a', 'steeple', 'the');
If you want to pass the whole list in a single parameter, use array datatype:
SELECT *
FROM word_weight
WHERE word = ANY('{a,steeple,the}'); -- or ANY('{a,steeple,the}'::TEXT[]) to make explicit array conversion
If you are not sure about the value and even not sure whether the field will be an empty string or even null then,
.where("column_1 ILIKE ANY(ARRAY['','%abc%','%xyz%']) OR column_1 IS NULL")
Above query will cover all possibility.