How to apply the functions of the pacman add-on package in R - 3 R programming examples - Extensive R code in RStudio - R tutorial
Scratch is a simple yet powerful programming language for children that is very easy to use yet contains many of the important programming constructs found in more “grown up” languages. This prese…
Explore sound science with a tonoscope, a device that helps you see sound vibrations. It's a super fun sound science experiment for kids.
Our school has adopted the Next Generation Science Standards and one of my favorite units in 1st grade is our Sound Unit. NGSS asks that students conduct experiments to explain that vibrations make sounds and sound can make materials vibrate. Today I’m sharing some of my favorite ways to keep sound hands-on and writing based!...
Teach your children what sound waves are and how they work using items you have at home. 4 simple sound science activities for kids.
The ACT official subject guides are a step by step guide for outlining the preparation for the ACT section tests. These prep guides provide students a concept-based outline for the subjects they plan to focus on. Each one of the official guides, is an efficient prep tool comprised of the most current and relevant test information packed into one guide. In addition to the book, the entire pool of questions are available online for a customizable learning experience. The ACT official subject guides are the best resource to get detailed input and practice to help you in preparation for the ACT. By using this guide, students can feel comfortable and confident that they are preparing to do their best! Features of the ACT® Official Reading Guide Includes: The only book with real ACT reading questions organized by question type, Includes tips and advice for reading more quickly and retaining information, detailed explanations for every official ACT.
Hello guys, if you are doing a code review and see a SELECT * in production code, would you allow it? Well, its not a simple question as it looks like but let's find out pros and cons about using SELECT * in a production SQL query and then decide. I have read many articles on the internet where people suggest that using SELECT * in SQL queries is a bad practice and you should always avoid that, but they never care to explain why? Some of them will say you should always use an explicit list of columns in your SQL query, which is a good suggestion and one of the SQL best practices I teach to junior programmers, but many of them don't explain the reason behind it. Unless you explain some reasons why one should not use SELECT * in queries, it's difficult to convince many SQL developers, many of whom have started learning SQL by doing SELECT * from EMP in the Oracle database. In this article, I will try to bridge that gap by giving some practical reasons why using SELECT * in the SQL query is not a good idea. 7 Reasons why using SELECT * in a Production SQL Query is a Bad Practice Without wasting any more of your time, here are my seven reasons which explain why using the SELECT star in a SQL query is a bad practice and you should avoid it. 1. Unnecessary IO By using SELECT * you can be returning unnecessary data that will just be ignored but fetching that data is not free of cost. This results in some wasteful IO cycles at the DB end, since you will be reading all of that data off the pages, then perhaps you could have read the data from index pages. This can make your query a little bit slow as well. See these free SQL and Database courses to learn more. 2. Increased network traffic SELECT * returns more data than required to the client which in turn will use more network bandwidth. This increase in network bandwidth also means that data will take a longer time to reach the client application which could be SSMS or your Java application server. 3. More application memory due to this increase in data, your application may require more memory just to hold unnecessary data which it will not be used but coming from Microsoft SQL Server or any other database you are connecting to. 4. Dependency on Order of Columns on ResultSet When you use the SELECT * query in your application and have any dependency on the order of columns, which you should not, the ordering of the result set will change if you add a new column or change the order of columns. 5. Breaking Views while adding new columns to a table When you use SELECT * in views then you create subtle bugs if a new column has been added and the old one is removed from the table. Why? because your view will not break but start returning an incorrect result. To avoid that, you should always use WITHSCHEMABINDING with views. This will also prevent you from using SELECT * in views. 6. Conflict in JOIN Query When you use SELECT * in the JOIN query, you can introduce complications when multiple tables have columns with the same name like status, active, name, etc. On a simple query, this might be fine but when you try to order by one of these columns or use the query in a CTE or derived table, you will need to make some adjustments. See Microsoft SQL for Beginners to learn more about JOINs in SQL Server. 7. Copying data from one table to other When you use SELECT * into INSERT .. SELECT statement, which is a common way to copy data from one table to another, you could potentially copy incorrect data into the incorrect column if the order of column is not the same between two tables. Some programmers think that using SELECT * vs SELECT 1 in your EXISTS code is faster because the query parser had to do extra work to validate the static value. That might have been true long ago but nowadays parser has become smart enough to know that within an EXISTS clause, the SELECT list is completely irrelevant. That's all about why you should not use SELECT * in a Production SQL query anymore. It's always better to use the explicit column list in the SELECT query than a * wildcard. It not only improves the performance but also makes your code more explicit. It also helps you to create maintainable code, which will not break when you add new columns to your table especially if you have views that refer to the original table. Other Programming Articles you may like to explore: 10 Things Java Developers Should Learn 20 Books Java Programmers Can Read Kotlin or Java? Which is better for Android developers? 10 Everyday tools for Java Programmers Python or Java? Which language is better to start with? 5 Courses to Learn Java 9 Better 10 highest paying technical jobs programmers can do 3 JVM Languages Java Developers should Learn Top 5 Courses to learn SQL and Database Top 5 Courses to learn MySQL for Beginners Top 5 Courses to learn PostgreSQL for Beginners Top 5 Courses to learn Microsoft SQL Server for Beginners Thanks for reading this article so far. If you think that these points make sense then please share with your friends and colleagues. If you have any questions or feedback then please drop a comment. P. S. - If you are keen to learn and improve your SQL skills but looking for free resources to start with, you can also check out this list of Free SQL and Database Courses for Programmers and Developers.
Hello Everyone! A couple of weeks ago we had the opportunity to go to a little science workshop. Thanks to our science instructional specia...
Try these easy sound experiments -- Elementary & Middle School kids will LOVE testing the science of sound with this fun wave experiment to create a 'gong' and explore how sound waves travel!
How does sound travel? This sound experiment for kids helps show how we hear using a slinky and also a tuning fork experiment.
Try these easy sound experiments -- Elementary & Middle School kids will LOVE testing the science of sound with this fun wave experiment to create a 'gong' and explore how sound waves travel!
Music can be extremely enjoyable to listen too and it improves our health. Discover 3 ways music therapy improves brain function.
Interactive lessons demonstrating the connection between sound and vibrations.
Looking for more ways to enhance learning with technology? Consider podcasts: This excellent collection of eight can be shared with your students tomorrow.
A few weeks ago I interviewed Pat Davidson during the re-release of his stellar training system, MASS. It’s one of the most effective (and brutal) training programs out there that makes people into beasts, and I have yet to come across anyone who hasn’t gotten amazing results if they happened to survive…;O) Pat’s kinda... Read more
It’s become almost the standard for many in the music. So i need to get up and running with recording software, and i think protools is the way to go, but i d
Use computer science to explore and learn about AI!
The multi sensory nature of music training and neuroplasticity included brain changes related to perception, sensation, performance and abstract reasoning.
Katarzyna Dowbor po tym, jak została zwolniona z TVP, niezbyt długo pozostawała na bezrobociu. Prezenterką zainteresowała się telewizja Polsat, która zaproponował jej rolę gospodyni w nowym reality show.
