If you want to build web applications quickly like overnight or over the weekend, then PHP and MySQL are the right choices and because of this power, they are also the best language for freelancing and startups where a quick turnaround time is required. PHP and MySQL are incredibly powerful open source technologies that allow programmers and web developers to create functional websites and apps that go way beyond basic HTML. PHP is specially designed to generate interactive and dynamic websites and is also known as the server-side scripting language, while MySQL is one of the leading relational databases along with Oracle and Microsoft SQL Server.
Second Highest Salary in MySQL and SQL Server - LeetCode Solution
Write a SQL query to get the second highest salary from the Employee table.
+----+--------+
| Id | Salary |
+----+--------+
| 1 | 100 |
| 2 | 200 |
| 3 | 300 |
+----+--------+
For example, given the above Employee table, the second highest salary is 200. If there is no second highest salary, then the query should return NULL. You can write SQL query in any of your favorite databases e.g. MySQL, Microsoft SQL Server, or Oracle. You can also use database specific feature e.g. TOP, LIMIT or ROW_NUMBER to write SQL query, but you must also provide a generic solution which should work on all database.
+----+--------+
| Id | Salary |
+----+--------+
| 1 | 100 |
| 2 | 200 |
| 3 | 300 |
+----+--------+
For example, given the above Employee table, the second highest salary is 200. If there is no second highest salary, then the query should return NULL. You can write SQL query in any of your favorite databases e.g. MySQL, Microsoft SQL Server, or Oracle. You can also use database specific feature e.g. TOP, LIMIT or ROW_NUMBER to write SQL query, but you must also provide a generic solution which should work on all database.
Difference between Self and Equi Join in SQL - INNER Join example MySQL
The main difference between Self Join and Equi Join is that In Self Join we join one table to itself rather than joining two tables. Both Self Join and Equi Join are types of INNER Join in SQL, but there is a subtle difference between the two. Any INNER Join with equal as join predicate is known as Equi Join. SQL Joins are the fundamental concept of SQL similar to correlated and noncorrelated subqueries or using group by clause and a good understanding of various types of SQL join is a must for any programmer.
SQL Join Tutorial - How to use JOIN Multiple Tables in SQL query? MySQL Example
Hello guys, if you are wondering how to join multiple tables in SQL to produce a combine result which contains columns from all tables but not sure how to do it then you have come to the right place. SQL Join is one of the basic concepts while working in databases or tables but yet less understood and most confusing topic for beginners and even intermediate developers. I compare Joins in SQL with Recursion in programming in terms of confusion because I have found that these two topics are special in their nature and you can't get it right with casual reading until you understand the concept and its various well. Things get worse when the table locked due to such SQL Join queries which were fired without knowing how much time it would and how big the result set could be.
When to use TRUNCATE vs DELETE command in SQL?
While working with the database we often need to delete data, sometimes to create more space, sometimes just remove all data to make the table ready for the next day's transaction, or sometimes just selectively remove stale data. SQL provides a couple of handy commands to remove data e.g. truncate, delete and drop. The last one is a bit different because instead of removing data it just deletes the table. What is the difference between truncate and delete command in SQL or when to use truncate vs delete is one of the most frequently asked SQL interview questions?
java.sql.SQLException: No suitable driver found for 'jdbc:mysql://localhost:3306/mysql [Solution]
This error comes when you are trying to connect to MySQL database from Java program using JDBC but either the JDBC driver for MySQL is not available in the classpath or it is not registered prior to calling the DriverManager.getConnection() method. In order to get the connection to the database, you must first register the driver using the Class.forName() method. You should call this method with the correct name of the JDBC driver "com.mysql.jdbc.Driver" and this will both load and register the driver with JDBC. The type 4 JDBC driver for MySQL is bundled into MySQL connector JAR like mysql-connector-java-5.1.18-bin.jar depending upon which version of MySQL database you are connecting.
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