Introduction In this article, we are going to see how the SQL EXISTS operator works and when you should use it. Although the EXISTS operator has been available since SQL:86, the very first edition of the SQL Standard, I found that there are still many application developers who don’t realize how powerful SQL subquery expressions really are when it comes to filtering a given table based on a condition evaluated on a different table. Database table model Let’s assume we have the following two tables in our database, that form a one-to-many... Read More
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Introduction In this article, we are going to see how a CROSS JOIN works, and we will also make use of this SQL join type to build a poker card game. Database table model For our poker card game application, we have created the ranks and suits database tables: The ranks table defines the ranking of cards, as well as the name and symbol used for each card rank: The suits table describes the four possible categories used by the French playing cards: Cartesian product In the set theory, the Cartesian product... Read More
Introduction In this article, we are going to see how a deadlock can occur in a relational database system, and how Oracle, SQL Server, PostgreSQL, or MySQL recover from a deadlock situation. Database locking Relational database systems use various locks to guarantee transaction ACID properties. For instance, no matter what relational database system you are using, locks will always be acquired when modifying (e.g., UPDATE or DELETE) a certain table record. Without locking a row that was modified by a currently running transaction, Atomicity would be compromised. Using locking for controlling access... Read More
Introduction Ever wanted to connect to a relational database using Java and didn’t know which JDBC Driver Maven dependency to use? If so, this article is surely going to help you from now on. Oracle Since September 2019, the Oracle JDBC Driver is available on Maven Central. For JDK 10 and 11, use the following Maven dependency: For JDK 8, use the ojdbc8 artifact instead: For more details about the proper version to use, check out the following Maven Central link. MySQL The MySQL Driver is available on Maven Central, so just... Read More
One of the biggest and undead myths in SQL is that COUNT(*) is faster than COUNT(1). Or was it that COUNT(1) is faster than COUNT(*)? Impossible to remember, because there’s really no reason at all why one should be faster than the other. But is the myth justified?
How does COUNT(…) work?
But first, let’s look into some theory. The two ways to count things are not exactly the same thing. Why?
COUNT(*)counts all the tuples in a group
COUNT(<expr>)counts all the tuples in a group for which
<expr>evaluates to something that
IS NOT NULL
This distinction can be quite useful. Most of the time, we’ll
COUNT(*) for convenience, but there are (at
least) two cases where we don’t want that, for example:
When outer joining…[Read more]
Introduction In this article, we are going to see how we can limit the SQL query result set to the Top-N rows only. Limiting the SQL result set is very important when the underlying query could end up fetching a very large number of records, which can have a significant impact on application performance. Why limit the number of rows of a SQL query? Fetching more data than necessary is the number one cause of data access performance issues. When a given business use case is developed, the amount of data available... Read More
The post How to limit the SQL query result set to Top-N rows only appeared first on Vlad Mihalcea.
Introduction In this article, we are going to see how we can sort an SQL query result set using an ORDER BY clause that takes a RANDOM function provided by a database-specific function. This is a very handy trick, especially when you want to shuffle a given result set. Note that sorting a large result set using a RANDOM function might turn out to be very slow, so make sure you do that on small result sets. If you have to shuffle a large result set and limit it afterward, then it’s... Read More
Ready to transition from a commercial database to open source, and want to know which databases are most popular in 2019? Wondering whether an on-premise vs. public cloud vs. hybrid cloud infrastructure is best for your database strategy? Or, considering adding a new database to your application and want to see which combinations are most popular? We found all the answers you need at the Percona Live event last month, and broke down the insights into the following free trends reports:
- Top Databases Used: Open Source vs. Commercial
- Cloud Infrastructure Analysis: Public Cloud vs. On-Premise vs. Hybrid Cloud
- Polyglot Persistence Trends: …
I have been managing multiple databases, mostly in Microsoft SQL Server and MySQL server, both on on-premise and cloud. We have faced a lot of challenging issues such as records deleted from a user table, backup file is corrupted, backup file is not compatible, backup files got deleted, backup storage is full and backup is running for long time, etc. When you are facing this issues for the first time, it is surprising to see new kind of issues every day and if you are not good in documentation, repetitive issues will keep occurring and we keep fixing rather than suctioning. If you are facing same challenges, then you need to focus on your backup and recovery strategy.
A well-designed backup and recovery strategy maximizes data availability and minimizes data loss without tolerating business requirement. In this post, we will discuss about the following topics:
- Recovery Time Objective (RTO) …
The tutorial guides you through MySQL Database connectivity with
We are facing entity framework database provider compatible with version could not be found for your data connection issue while connecting with MySQL 5.7 and 8.0. Problem with MySql.Data.Entity.EF6.dll missing and not able to connect with Entity framework
As per my requirements, the customer wants to migrate MSSQL to MySQL server. So I want to use any version of MySQL, installed with below configurations and achieve the connectivity 1.MySQL Server : 5.6.41
2.MySQL Connector/Net : 6.9.12
3.Entity Framework : 6.2.0
4.Visual Studio : Professional 2017 Configuration steps are below,
1. Download required versions,
MySQL - https://dev.mysql.com/downloads/windows/installer/5.7.html
Visual Studio - https://visualstudio.microsoft.com/downloads/
2. Once downloaded, …
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