¿Qué quieres decir con explicación SQL en resumen?

What do you mean by SQL Explain in short?

Structured Query Language
Basically, SQL stands for Structured Query Language which is basically a language used by databases. This language allows to handle the information using tables and shows a language to query these tables and other objects related (views, functions, procedures, etc.).

To select the data that you want to use, you use a select query. A select query is a database object that shows information in Datasheet view. A query does not store data, it displays data that is stored in tables. A query can show data from one or more tables, from other queries, or from a combination of the two.

It is a reliable and efficient language used for communicating with the database. Some advantages of SQL are as follows: Faster Query Processing – Large amount of data is retrieved quickly and efficiently. Operations like Insertion, deletion, manipulation of data is also done in almost no time.

What Is SQL Queries? A query is a question, regularly communicated formally. A database query can be either a select question or an action query. A select query is an information recovery query, while an activity query requests extra tasks on the information, for example, addition, refreshing or deletion.

Scenario 2 : I would like to select data of the Employee whose salary is maximum and with that i would like to show the department of that Employee as well. Step 1 :Analyzing Business Logic of Query and Fragment it. 1.Fetching data from Employee as well as Department. 2.Use of Aggregate function to calculate maximum salaried Employee.

Query languages are utilized to make queries in a database, and Microsoft Structured Query Language (SQL) is the standard. Under the SQL query umbrella, there are a few augmentations of the language, including MySQL, Oracle SQL and NuoDB.

A first thing that you can already check when you have written your query is whether the SELECT statement is as compact as possible. Your aim here should be to remove unnecessary columns from SELECT. This way you force yourself only to pull up data that serves your query goal.