calculated-columns Questions
7
Solved
I have a data frame that has 2 columns.
column1 has random numbers in
column2 is a place holding column for what i want column3 to look like
random temp
0.502423373 1
0.687594055 0
0.741883739 0...
Otey asked 6/12, 2013 at 4:34
3
What I'm looking for is a "best-practices-approved" alternative
to the following workaround / workflow. Consider
that I have a bunch of columns of similar data, and would like to perform ...
Gca asked 18/7, 2014 at 20:26
10
Solved
I am creating a computed column across fields of which some are potentially null.
The problem is that if any of those fields is null, the entire computed column will be null. I understand from the...
Disparage asked 26/5, 2010 at 21:5
1
I have to check if a date column is in a range. In particular I have to check if it is included in a range given by another date +/- n days. Suppose my dataframe is:
import pandas as pd
d = {
'dat...
Dola asked 13/2, 2019 at 8:22
2
Solved
I've a dataframe and I want to add a new column based on a value returned by a function. The parameters to this functions are four columns from the same dataframe. This one and this one are somewha...
Teach asked 22/11, 2018 at 0:52
2
When reading from database, I want to sort my Post entities based on two factors:
likes count (the more the better)
age (the newer the better)
Currently I have implemented it this way (as a cal...
Athwart asked 18/9, 2018 at 20:35
2
Solved
Here is my situation:
In my table i two fields:
- Price (decimal (15,4)
- TaxId (int)
TaxId value is not stored anywhere but there are only two values (actualy 3).
- 1 (8.5%)
- 2 (20%)
- NULL ...
Brinn asked 6/6, 2012 at 10:7
3
Solved
I'm trying add a new column to a data frame based on several conditions from other columns. I have the following data:
> commute <- c("walk", "bike", "subway", "drive", "ferry", "walk", "bik...
Wenn asked 9/9, 2016 at 7:1
3
I've a simple table with some amount and interval in sec by date and product name.
Month | Product | Amount | Interval in sec
------------------------------------------
05-'12| Prod A | 10 | 5
05-...
Sunbonnet asked 13/9, 2012 at 8:21
2
Solved
How to check if computed column is persisted? (MS SQL Server)
Inspiration asked 11/3, 2011 at 12:17
5
I am having trouble using a calculated column in postgres. A similar code which works in SQL is given below, is it possible to recreate this in PostgreSQL?
select cost_1, quantity_1, cost_2, quant...
Sporting asked 12/1, 2012 at 18:23
1
Solved
I have a df akin to df1 where I want to break out the rows so that the HOURS column is in intervals of 4, shown in df2. How would I approach this problem and what packages are recommended?
IDs can...
Earthy asked 4/6, 2018 at 23:48
2
Solved
I'm looking to add a new column to a pre-existing table which is filled with values. The new column is going to be NOT NULL, and so for each pre-existing row it will need a value.
I'm looking for ...
Exieexigency asked 19/3, 2018 at 16:58
2
Solved
I have a database called temp, with daily stock prices:
Ticker Date price
ABC 01/01/13 100.00
ABC 01/02/13 101.50
ABC 01/03/13 99.80
ABC 01/04/13 95.50
ABC 01/05/13 78.00
XYZ 01/01/13 11.50
...
Bribery asked 17/2, 2018 at 5:30
3
This is My table :
ID Q1 Q2 Q3 Q4
----------------------------------------------------------------
20130712 NULL 728.63 NULL NULL
20130712 8881.55 9673.68 2629.566 6251.984
20130713 1813 1813 84.4...
Sandasandakan asked 15/8, 2013 at 4:4
3
Solved
If I include a computed column in a table, does it place a perfomance burden on it?
For example, if I have a table defined as follows:
CREATE TABLE users(
givenname …,
familyname …,
fullname A...
Disesteem asked 29/9, 2017 at 6:25
5
Solved
I have a persisted computed column in a large table in in SQL Server 2005.
I want to convert it to a regular column, keeping current values.
Do I have to recreate the column and update the entire...
Machellemachete asked 10/11, 2010 at 11:15
4
Solved
I have a (rather complicated) SQL statement where I select data from lots of different tables, and to cope with a bad legacy data structure, I have a couple of custom columns that get their values ...
Protecting asked 16/7, 2010 at 12:47
2
Solved
I am developing a rental marketplace application with Rails 5. It has a quite simple structure with users, products and orders, with the products belonging to users, who actually create them.
In o...
Foote asked 27/2, 2017 at 9:26
3
Solved
The following code/outcome baffles me as to why data.table returns NA for the mean functions and not the sd function.
library(data.table)
test <- data.frame('id'=c(1,2,3,4,5),
'A'=seq(2,9,leng...
Fiendish asked 27/8, 2014 at 19:34
2
Solved
I have a problem about the difference calculation for the rows using calculated column in Spotfire.
I am wondering if it is possible to create a calculated column that will count the difference be...
Loan asked 23/9, 2016 at 13:35
2
Solved
Regarding the previous question which I have posted:
calculation the difference for same column for the specific rows in Spotfire
I have a new problem for it, below is the sample:
The new funct...
Andromada asked 27/9, 2016 at 12:59
2
Can I create a generated column in table A which sums up a column in table B with a tableA_id of the row in table A?
Suppose I have a table of of families, and a table of children. I want a sum of...
Abad asked 19/7, 2016 at 2:21
2
Solved
I am getting odd results when using NEWID() in combination with a persistent computed column. Am I using some function wrong?
Not using persisted when creating the column, and therefore calculatin...
Exurb asked 30/6, 2016 at 10:38
2
Solved
I have a dataframe, trip:
> head(trip.mutations)
Ref.y Variant.y
1 T C
2 G C
3 A C
4 T C
5 C A
6 G A
I want to add a third column, mutType, that follows these rules:
for (i in 1:nrow(...
Ahmedahmedabad asked 26/4, 2014 at 20:29
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