# Why can't I use a boolean expression in a SQL CASE expression inside a WHERE clause?

I want to write a query with the following logic: If @fundKey is greater than 0, look for funds with a key matching @fundKey. Otherwise, look for funds with a key less than 1000000. If I were to write this logic in JavaScript it would be something like this: funds.filter(x => fundKey > 0 ?… Read More Why can't I use a boolean expression in a SQL CASE expression inside a WHERE clause?

# I have trouble with changing the process of that code in Java

I have trouble with changing my code. I want to do that with a boolean and I have no clue how to do that. It is just confusing me. This is my task: Tyrepressure-test It is to check whether the pressure of all tires is between 35 and 45. If a tire is outside this… Read More I have trouble with changing the process of that code in Java

# Check if all rows are equal by group ID and return boolean value

I have a data frame where a unique ID is given to each unique instance where there is a string in either title.1 or title.2. Each ID is coded with one or more names. See below: title.1 title.2 name ID A A1 fruit 1 A A1 fruit 1 B1 fruit 2 B fruit, vegetable 3… Read More Check if all rows are equal by group ID and return boolean value

# Is there a faster way of evaluating every combination of booleans in an if statement in python?

If I have 4 booleans e.g if ((a(x) == True) and (b(x) == True) and (c(x) == True) and (d(x) == True) then I want to do something different for each combination including when only 3 of them are true (including which ones), 2…, then only each 1… etc… Is there a quicker way than… Read More Is there a faster way of evaluating every combination of booleans in an if statement in python?

# Why is bool([]) == False while [] == False is False and not True in python boolean logic

I’ve just started learning Python and i was trying this [] == False #False but : bool([]) #False from what i got values like [],0 .. are False what did i missed exactly and thanks! >Solution : The operator == is very literal. If the 2 things you are comparing are not exactly the same… Read More Why is bool([]) == False while [] == False is False and not True in python boolean logic

# Count conditions within each row in Pandas Dataframe

I have this dataframe: Char1 Char2 Char3 0 2 2 3 1 2 3 3 2 2 3 3 3 2 2 2 I need to create three columns (_1, _2, _3), each of which counts the occurrence of the values 1, 2 and 3 respectively in each row. So the output would look like… Read More Count conditions within each row in Pandas Dataframe

# How to compare a value to a list of pairs in a list comprehension?

I need to create a list that is n long where each item is a Boolean. The item will only be True when x is in the range of one or more pairs of integers. For example, my current code is as follows: l = [True if a < x < b or c <… Read More How to compare a value to a list of pairs in a list comprehension?

# how this Ternary Operator work with this statemnt?

i just generate this methode to find max val in some matrix and somehowe i was able to change int val insdie Ternary Operator (java 8) int max=0, indexToReturn=0; int size= arr[0].length; for (int i=1 ; i < size ; i++) { // // ¯\_(ツ)_/¯ max = (!(arr[j][indexToReturn] > arr[j][i])) ? indexToReturn= i : arr[j][indexToReturn]… Read More how this Ternary Operator work with this statemnt?

# How to count/sum the number of text cells in a row

I have a simple modell that stores text values. I like to count how many text cells I have in a single row where the result is not "nincs". In this case I like to have (kap_bar_01 + kap_bar_02 + kap_bar_03 + kap_bar_04 + kap_bar_05) and the result I need is 3. I tried this… Read More How to count/sum the number of text cells in a row

# Why is `!!(a||!a)` always true?

I’m a Java rookie and in School we got some homework. I shall explain boolean terms but I don’t understand one of them. The question is Why is this expression always true? !!(a||!a) I understand the part in the brackets but what do the two exclamation marks in front of it? If the first a… Read More Why is `!!(a||!a)` always true?