The MySQL REPLACE Clause Explained

In this mysql tutorial we’ll explain the MySQL REPLACE clause and tell you how it works, what can it do, and how to use it together with other SQL queries for the best results possible.
In MySQL server, the REPLACE clause is used together with the UPDATE clause and works exactly like INSERT does. In other words, it either:
1) INSERTs or
2) DELETEs and INSERTs.

As far as we know, REPLACE isn’t part of the SQL standard, but it is the MySQL server’s extension to it.
REPLACE is to be used with other types of SQL queries like UPDATE.

To replace data when updating, use this SQL query:
UPDATE x
SET col = REPLACE(col, ‘A’, ‘B’)
WHERE col [=|!=|LIKE] ‘…’;

Here:
x – Table Name
col – Column Name
… – Your Query
A – Value to be replaced
B – New Value

To avoid database slowness reasons from being introduced to your sql database, take good care of your sql database and make sure to subscribe to this channel for more information!

Below you will also find a couple of sql interview questions and answers:

Q: What are some of the main database slowness reasons?
A: We’ve already made a video on this, but the main database slowness reasons are as follows:
1. Selecting too much data
2. Selecting unnecessary data
3. Scanning through many unnecessary rows

To reduce slow sql queries, make sure to use sql indexes.

Q: What is a sql index?
A: sql indexes explained goes like this: a sql index is a database structure used to quickly find rows in a table within a database.

Q: How dangerous is SQL injection? How to protect our web applications against it?
A: SQL injection is one of the most dangerous attacks directed at databases and web applications. To protect against SQL injection don’t forward user input to SQL queries.

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Keep these tips in mind and until next time!

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