Tag: Exists
How check if a given key exists in a Map | C++
In this article we will discuss how to find if a given key exists in map or not. Map internally store elements in Key-Value pair. It provides 2 member functions to check if a given key exists in map i.e. Advertisements std::map::find std::map::count Check if map contains a key using std::map::count std::map provides a member …
Python : How to Check if an item exists in list ? | Search by Value or Condition
In this article we will discuss different ways to check if a given element exists in list or not. Table of Contents Introduction Check if element exists in list using python “in” Operator Check if element exist in list using list.count() function Check if element exist in list based on custom logic Introduction Suppose we …
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How to check if a file or directory or link exists in Python ?
In this article we will discuss techniques in python to check if a file exists or a link or a directory exists or not. Python – Check if a path exists Python’s os module provides a function to check if a given path exists or not i.e. Advertisements os.path.exists(path) It will True if the path …
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Python : How to remove a file if exists and handle errors | os.remove() | os.ulink()
In this article we will discuss how to remove a file if only it exists and how to handle other types of exceptions using os.remove() & os.ulink(). How to remove a file using os.remove() python ‘s os module provides a function to remove the file i.e. Advertisements os.remove(path_of_file) It accepts the file path as argument …
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Pandas : Check if a value exists in a DataFrame using in & not in operator | isin()
In this article we will dicuss different ways to check if a given value exists in the dataframe or not. First of all, we need to import the pandas module i.e. Advertisements import pandas as pd Let’s create a dataframe, # List of Tuples empoyees = [(‘jack’, 34, ‘Sydney’, 155) , (‘Riti’, 31, ‘Delhi’ , …
Pandas : Check if a value exists in a DataFrame using in & not in operator | isin()Read More
Python: Check if a value exists in the dictionary (3 Ways)
In this article we will discuss different ways to check if a value exists in a dictionary or not. We will cover the following ways, Subscribe Table Of Contents Check if value exist in dict using values() & if-in statement Check if a value exists in python dictionary using for loop Check if a value …
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MySQL check if table exists
At times there is an essential requirement to find out if a table exists or not in a database, and the same, we will be looking into this article particularly: MySQL check if table exists : SHOW TABLES. MySQL check if table exists : Information Schema. Function to check if the table exists or not …
Insert into a MySQL table or update if exists
While inserting rows into a table, there are times when the requirement is to insert the rows into a table, but if the key already exists, then update the value. This concept is also known as UPSERT, which is combining UPDATE with INSERT. In this article, we will be looking into : Insert or Update …
MySQL IF EXISTS DROP Table
This article will be looking into how to drop a table if it exists in the database. How to DROP Table IF EXISTS in MySQL How to DROP Temporary Table IF EXISTS in MySQL How to DROP Table IF EXISTS in MySQL What all does a DROP TABLE statement does? DROP TABLE statement will remove one …
INSERT record if NOT EXISTS in MySQL
This article will discuss how to insert a record IF NOT EXISTS in MySQL. We will be using MySQL subqueries with NOT EXISTS clause to fulfill the purpose. Table of Contents INSERT NOT EXISTS Syntax INSERT single record if NOT EXISTS in MySQL INSERT multiple record if NOT EXISTS in MySQL INSERT record or UPDATE …