Tag: Exists
Python: Check if value exists in list of dictionaries
In this article we will discuss different ways to check if a given value exists in a list of dictionaries or not. Table of Contents: Get all values in a list of dictionary & check if a given value exists. Iterate over all the dicts in a list of dicts & check if a given …
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MySQL ADD COLUMN IF NOT EXISTS
This article will discuss the script to add a column to a MySQL table only if it does not already exist. Let us get started by making the sample table using the create table script. CREATE TABLE IF NOT EXISTS sale_details ( id INT auto_increment, sale_person_name VARCHAR(255), no_products_sold INT, sales_department VARCHAR(255), primary key (id) ); …
MySQL create table if not exists
This article will discuss the script to create a table in MySQL only if it does not already exist. We will be using the IF NOT EXISTS clause within the create table script. Further, in the examples, we will be writing create table scripts using the IF NOT EXISTS clause and without it to analyze the difference …
Javascript: Check if key exists in Object (4 ways)
While working in javascript, there is often a requirement to determine if a key exists in a particular object. This article demonstrates easy ways to check if a key exists in a javascript object using different methods and example illustrations. Table of Contents: Check if key exists in javascript Object using in operator Check if …
Check if a Column exists in Pandas DataFrame
In this article, we will discuss how to check if a column or multiple columns exist in a Pandas DataFrame or not. Suppose we have a DataFrame, Name Age City Country Budget a jack 34 Sydney Australia 200 b Riti 30 Delhi India 321 c Vikas 31 Mumbai India 333 d Neelu 32 Bangalore India …
Check if a substring exists in a String in Python
In this tutorial, you will how to check if a String contains a substring or not in Python. Table Of Contents Introduction Check if a String contains a substring using the find() method Check if a String contains a substring using the count() Check if a String contains a substring using the operator.contains() Check if …
Check if a number exists in a list in Python
In this article, we will discuss different ways to check if a list contains a given number or not. Table Of Contents Method 1: Using in operator Method 2: Using any() function Method 3: Using filter() function Method 4: Using list.count() function Summary Method 1: Using in operator We can directly use the in operator …
Add element to List if not already exists using Python
This tutorial will discuss about unique ways to add element to list if not already present in List. Table Of Contents Introduction to not in Operator in Python Using ‘not in’ Operator to append element if not already present in Python List Example 1 Example 2 Summary Introduction to not in Operator in Python In …
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Check if a value exists in a NumPy Array
This tutorial will discuss about unique ways to check if a value exists in a NumPy array in Python. Table Of Contents Technique 1: Using “in” keyword Technique 2: Using isin() and any() methods Summary Technique 1: Using “in” keyword Python provides an “in” keyword to check if a sequence contains a value or not. …
Check if an index exists in array in PHP
This tutorial will discuss about unique ways to check if an index exists in array in php. Table Of Contents Method 1: Using array_key_exists() function Method 2: Using isset() function Summary Method 1: Using array_key_exists() function The array_key_exists() function in PHP accepts an index/key and an array as arguments. It checks if the given array …