As the data in a database increases, search performance can suffer. The larger the dataset, the harder it is for the database engine to find the documents that match the query quickly. Database administrators can use indexes to aid the database engine and improve its performance. In this tutorial, you’ll learn what indexes are, how to create them, and confirm whether they’re used to query the database.
URL: https://www.progressiverobot.com/sql-interview-questions-answers/ SQL interview questions are asked in almost all interviews because database operations are very common in applications. SQL stands for Structured Query Language, which is a domain-specific programming language used for database communications and relational database management. SQL consists of standard commands for database interactions such as SELECT, INSERT, CREATE, DELETE, UPDATE, DROP […]
In this tutorial, you’ll practice using mathematical expressions. First, you’ll use numeric operations on a calculator, then use those operators on sample data to perform queries with aggregate functions, and finish with a business scenario to query sample data for more complex information and analysis.
URL: https://www.progressiverobot.com/sql-like-sql-not-like/ SQL LIKE is used with WHERE clause to search for a pattern for a column. Wildcards are the one which is used for specifying the pattern. There are two wildcards that are used with the LIKE operator. %: Percentage is used for representation of single, multiple or no occurrence. _: The underscore is […]
In SQL, primary keys serve as identifiers for individual rows in a table. In this tutorial, you’ll learn about primary keys and use a few different kinds to identify unique rows in database tables. Using some sample datasets, you’ll create primary keys on single columns and multiple columns, and use autoincrementing sequential keys.
URL: https://www.progressiverobot.com/sql-select-statement-with-count/ Hey, folks! In this article, we will be focusing on SQL SELECT statement along with COUNT() function. What is SQL SELECT statement? [SQL SELECT statement](/community/tutorials/sql-select) helps us select and display the data values from the particular table of the database. Syntax: SELECT columns FROM Table-name; Example: SELECT * from Info; SELECT * statement […]
MySQL supports the use of stored procedures, which group one or multiple SQL statements for reuse under a common name. Using stored procedures, you can create reusable routines for common tasks to be used across multiple applications, provide data validation, or deliver an additional layer of data access security. In this tutorial, you’ll learn what stored procedures are and how to create basic stored procedures that return data and use both input and output parameters.
URL: https://www.progressiverobot.com/sql-timestamp/ Hey, all. In our series of [SQL DATE and TIME functions](/community/tutorials/sql-date-time), in this article, we will learn the SQL TIMESTAMP() function in detail. The SQL DATE and TIME functions enable us to deal date-time data. Moreover, using these functions, we can extract a portion of the date and time from the datetime expressions. […]
When working with relational databases and SQL, most operations on the data are performed as a result of explicitly executed queries, such as SELECT, INSERT, or UPDATE. However, SQL databases can also be instructed to perform pre-defined actions automatically every time a specific event occurs through triggers. In this tutorial, you’ll use different SQL triggers to automatically perform actions where rows are inserted, updated, or deleted.
MariaDB is an open-source relational database management system. As with other relational databases, MariaDB stores data in tables made up of rows and columns. Users can define, manipulate, control, and query data using Structured Query Language, more commonly known as…
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