Tag: one
C++ : How to Initialize a map in one line using initialzer_list ?
In this article we will discuss how to initialize a map with std::initialzer_list<T>. Let’s create a map of string as key and int as value and initialize it with initializer_list i.e. Advertisements // Initialize a Map of string & int using initializer_list std::map<std::string, int> mapOfMarks = { {“Riti”,2}, {“Jack”,4} }; Here compiler will create following …
C++ : How to Initialize a map in one line using initialzer_list ?Read More
map vs unordered_map | When to choose one over another ?
In this article we will compare std::map and std::unordered_map and will also discuss when to choose one over another. Both std::map & std::unordered_map store elements in key value pair & provide member functions to efficiently insert, search & delete key value pairs. Advertisements But they are different in following areas, Internal Implementation Memory Usage Time …
map vs unordered_map | When to choose one over another ?Read More
Python : How to copy files from one location to another using shutil.copy()
In this article we will discuss how to copy files from one directory to another using shutil.copy(). shutil.copy() Python’s shutil module provides a function shutil.copy() i.e. Advertisements shutil.copy(src, dst, *, follow_symlinks=True) It copies the file pointed by src to the directory pointed by dst. Parameters: Frequently Asked: Python : How to remove files by matching …
Python : How to copy files from one location to another using shutil.copy()Read More
Python: if-else in one line – ( A Ternary operator )
In this article, we will learn how to use if-else in one line in python. Other programming languages like C++ and Java have ternary operators, which are useful to make decision making in a single line. Python does not have a ternary operator. But in python, we can use the if-else in a single line, …
Python: if-else in one line – ( A Ternary operator )Read More
MySQL Delete Duplicate Rows but keep one
In this article, we will see how to delete duplicate rows from a table and keep only one using various ways, mainly: Delete the duplicate rows but keep latest : using GROUP BY and MAX Delete the duplicate rows but keep latest : using JOINS Delete the duplicate row but keep oldest : using JOINS …
MySQL Select where Count is greater than one [Solved]
In this article, we will be looking into the count() function with select statement and conditions. Table of Contents Select where count is greater than one : using HAVING Clause Select where count is greater than one : using JOINS Select where count is greater than one : using Exists Let us get started by …
MySQL Select where Count is greater than one [Solved]Read More
Concatenate multiple MySQL rows to one field
This article will see how to concatenate the MySQL query results from multiple rows into a single field through many examples. We can also say that we want to see the results from the MySQL query into a single-row column. We will be using the GROUP_CONCAT() function of MySQL in the below examples. GROUP_CONCAT(expression) will …
Select all columns except one of a MySQL table
This article will look into how to select * from a table except for one column. We will be discussing two ways to get all the columns of a table except one. Table of Contents:- Select * except one column from a MySQL table using temporary tables Select * except one column from a MySQL …
Select all columns except one column in Pandas
In this article, we will discuss different ways to select all columns of a Pandas dataFrame except one specified column. Table Of Contents what do you mean by DataFrame in pandas? Select all columns except one using DataFrame.loc[] Select all columns except one using DataFrame.drop() Select all columns except one using series.difference() Select all columns …
How to sort a Pandas DataFrame by one column?
In this article, we will discuss how to use the sort_values() function to sort a pandas DataFrame by one column. Although, the sort_values() is very simple to use, but we will try to cover multiple situation. Table of Contents Preparing dataset for solution Sorting DataFrame based on a single column Sorting DataFrame in Descending Order …