Tag: Update)
Java : How to update the value of an existing key in HashMap | put() vs replace()
In this article we will discuss different ways to update the value of an existing key in HashMap in Java. Suppose we have a HashMap of words and their frequency count i.e. Advertisements // Create a Map of words and their frequency count HashMap<String, Integer> mapOfWords = new HashMap<String, Integer>() { { put(“John”, 25); put(“at”, …
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Python Set: add() vs update()
In this article we will discuss the main differences between add() and update() functions of Set in python. In python, set class provides two different functions to add or append elements in the set. Before going into the differences, first let’s have a basic overview about them, Advertisements set.add() Function: set.add(element) It accepts an element …
Python Dictionary update()
In this article discuss how to use the update() method of the dict class in python and then we will look at some examples of the update() function. dict.update() Syntax: In python, dict class provides a function to update the values of keys i.e. Advertisements dict.update([sequence]) Parameter: Sequence: An optional iterable sequence of key-value pairs. …
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 trigger example before update
In this article, we will see how to create the BEFORE UPDATE trigger with a practical example. Table of Contents:- Syntax of BEFORE UPDATE trigger Example of BEFORE UPDATE trigger READ MORE ABOUT TRIGGERS: What are triggers in MySQL Advertisements Let us get started by making the sample data. We will be creating a table cust_accounts followed …
MySQL trigger example after update
In this article, we will see how to create the AFTER UPDATE trigger with a practical example. Table of Contents:- Syntax of AFTER UPDATE trigger Example of AFTER UPDATE trigger READ MORE ABOUT TRIGGERS: What are triggers in MySQL Advertisements Let us get started by making the sample data. We will be creating two tables, patient_food_allergies, …
MySQL Update with Inner Join
This article will look into how to update rows to a MySQL table using the INNER JOINs. INNER JOINs help us retrieve records from more than one table having a condition satisfied by both and are logically related to each other. Let us get started by making the sample data. We will be creating two tables, employee_designation and employee_rating, followed by inserting a …
Mysql update column with value from another table
This article will update columns in a MySQL table with values from another table using different methods. Table of Contents:- Update column with value from another table using JOIN Update column with value from another table using INNER QUERY Update column with value from another table using CURSOR Let us get started by creating the …
Mysql update set multiple rows
This article will see how to update multiple rows with different values of a MySQL table in a single query. We will be illustrating the concept with various examples. Let us get started by making the sample data. We will be creating a table, sale_person_data, followed by inserting a few rows to it. # create the …
Mysql update set multiple columns
This article will see how to update multiple columns of a MySQL table in a single query. We will be illustrating the concept with various examples. Table of Contents:- MySQL update set multiple columns for a single row MySQL update set multiple columns for multiple rows Let us get started by making the sample data. …