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21 lut 2013 · MySQL supports IF statement. UPDATE abbonamento SET punti = IF(tipo = 'punti', punti - 1, punti), bonus = IF(tipo <> 'punti', bonus - 1, bonus) WHERE id = 17 or you can also use CASE
22 lip 2024 · The MySQL UPDATE query is used to update existing records in a table in a MySQL database. It can be used to update one or more field at the same time. It can be used to specify any condition using the WHERE clause.
Right Join: Returns all rows from the right table, even without matches on the left. Full Join: Returns rows with at least one match in either table. This is one of the most frequently asked questions in MySQL interview questions, as it is related to database relationships and queries. 18.
20 cze 2024 · 1. What are the features of MySQL? MYSQL is open-source, has very rich documentation, a wide range of interfaces and functions for application programming, and has many stored procedures like triggers and cursors that help in managing the database. Also, the Query optimizer is very efficient in MySQL. 2. Name the benefits and drawbacks of MySQL.
3 sty 2024 · Intermediate MySQL Interview Questions 1. What are the types of relationships used in MySQL? There are three categories of relationships in MySQL: One-to-One: Usually, when two items have a one-to-one relationship, you just include them as columns in the same table.
30 lip 2019 · MySQL UPDATE using IF condition. MySQL MySQLi Database. The syntax is as follows to perform UPDATE using IF condition in MySQL −. update yourTableName set yourColumnName =if(yourColumnName =yourOldValue,yourNewValue,yourColumnName); To understand the above syntax, let us create a table. The query to create a table is as follows −.
12 wrz 2022 · We will start with some of the most fundamental SQL interview questions about databases and increase the difficulty level along the way. Frequently Asked SQL Interview Questions. 1. What is a Database? A database refers to a structured data collection that can be stored, managed, and retrieved from a remote or local computer system.
