records Questions
2
Solved
I have looked at this question which addresses updating multiple records in one query.
The general solution is
UPDATE table_name
SET field_to_update = CASE table_key
WHEN key_value1 THEN field...
2
Solved
Problem: I have different record types with many common fields. How could I "include" the common fields in the record type definitions?
Example:
newtype RecordType1 = RecordType1 { a :: Int, b ::...
Roadhouse asked 23/8, 2018 at 13:25
2
Solved
I want to delete records from a db table based on a time-stamp for each record. I would like to have it automatically delete records compared to a date/time interval without user intervention or ad...
Allethrin asked 24/2, 2009 at 16:45
5
Solved
I'm using lots of different records in a program, with some of them using the same field names, e.g.
data Customer = Customer { ..., foo :: Int, ... }
data Product = Product { ..., foo :: Int, ......
Morion asked 23/11, 2010 at 20:21
2
I have a record type
tLine = record
X, Y, Count : integer;
V : boolean;
end;
I have a
function fRotate(zLine: tLine; zAngle: double): tLine;
I want to pass zLine, but with its Y field redu...
Bussard asked 24/8, 2017 at 13:22
1
Solved
I'm currently going through the Type-Driven Development with Idris book.
I have two questions relating to the design of the example data store in Chapter 6. The data store is a command line applic...
Kanzu asked 4/8, 2017 at 10:5
4
I want to insert only Distinct Records from Table "A" to Table "B". Assume both the tables has same structure.
2
Solved
I am a Haskell rookie and I often find myself having to decompose a data with pattern matching only to apply a function to one of its member and then reassemble it.
Say I have:
data Car = Car { g...
Etem asked 5/4, 2017 at 20:42
1
Solved
SITUATION
I am studying "More Coding in Delphi" by Nick Hodges, and he is using a TFraction record to explain operator overloading. I have written by myself this record:
type
TFraction = record...
Sextain asked 8/2, 2017 at 17:27
2
Suppose that I have some simple algebraic data (essentially enums) and another type which has these enums as fields.
data Color = Red | Green | Blue deriving (Eq, Show, Enum, Ord)
data Width = Thi...
Mosera asked 7/1, 2017 at 15:20
1
Solved
Related post: How to disambiguate selector function?
https://ghc.haskell.org/trac/ghc/wiki/Records/OverloadedRecordFields/DuplicateRecordFields
However, we do not infer the type of the argument...
3
Solved
What is difference between tuples and records?
Southland asked 18/11, 2010 at 6:40
1
Solved
I'm writing a modular and extensible text editor in Haskell and I'd like to implement plugins in such a way: The writer of the plugin provides a single function that looks something like this:
han...
1
Solved
I'm looking for a simple way to return a new structure which is a copy of an existing one with some fields changed, without modifying the original.
I get that you can use setf to change the data i...
Journalize asked 17/7, 2016 at 13:25
1
Solved
I'm am trying to call the to_dict function on the following DataFrame:
import pandas as pd
data = {"a": [1,2,3,4,5], "b": [90,80,40,60,30]}
df = pd.DataFrame(data)
a b
0 1 90
1 2 80
2 3 40
3 4...
3
I am working for a company and we have a domain name hosted on GoDaddy. For the website/application we are creating, we need to be able to programmatically add "A records" to the DNS zone file to p...
8
Solved
I'm almost sure I will have to create a new excel file, but maybe at least here I get some ideas what was the source of the problem.
My excel file is constantly giving the following error:
Excel...
1
Solved
I'm currently trying to clean up a database of mailing subscribers that a former employee created. I've been able to consolidate and fix most issues (primarily duplicates), but I have instances of ...
1
I have following datatype defined as record
data Config = Config
{ field1 :: String
, field2 :: String
, field3 :: String
}
I want to iterate over each field of Config, apply some function S...
3
Solved
I have a script that runs every hour on my php site. In that script I would like some kind of MySQL query to delete every record from a table but say the latest 50.
How would I do something like ...
Retention asked 16/1, 2012 at 20:44
1
I've been reading A wreq tutorial:
A lens provides a way to focus on a portion of a Haskell value. For
example, the Response type has a responseStatus lens, which
focuses on the status informa...
Devan asked 8/3, 2015 at 17:18
2
Solved
I need to get an variable type that has 3 types of values, the only way I know to do that is "Records", but I know there is no such type as "Records" in Java but ArrayList, but I don't get it...
M...
Aeroneurosis asked 19/2, 2015 at 13:16
1
Solved
I don't quite understand why this works:
module Records where
type Element e = { element :: String, label :: String | e }
type Sel = ( value :: Number, values :: [Number] )
type Select = Element...
Pact asked 8/2, 2015 at 16:7
0
Here is an example of some Agda (2.4.2) code defining games and a binary operation on games.
module MWE where
open import Data.Sum
open import Size
data Game (i : Size) : Set₁ where
game : {Mov...
Anonym asked 23/12, 2014 at 16:20
2
How to clone or copy records in same table in PostgreSQL by creating temporary table.
trying to create clones of records from one table to the same table with changed name(which is basically compo...
Endymion asked 21/10, 2014 at 20:6
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