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When used outside of a string, the percentage symbol % is the modulus operator, i.e. an operator which returns the remainder following division of the number preceding the operator by that following it.. Therefore, in your example, the expression % 2 = 0 will be validated if the number preceding the percentage symbol is even, e.g. 12 % 2 = 0 will return True.
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BetaW3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.
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BetaWhen you are new to programming in SQL, you will come across a lot of hard-to-search-for character operators. If you are prone to forgetting ~ is called tilde, are wondering why there are so many %s in your strings, or have a hard time googling what the (+) symbol in where users.group_id(+) = group.id, this guide is for you. Comparison Operators
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BetaIn SQL, the RIGHT JOIN (also called RIGHT OUTER JOIN) is an essential command used to combine data from two tables based on a related column. It returns all records from the right table, along with the matching records from the left table.
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BetaWhat is SQL. SQL, or Structured Query Language, is a programming language designed to interact with databases. When you want to access data in a database, be it to alter, delete, add, or simply extract information, you use SQL. SQL can work and interact with large amounts of data. Its syntax is sleek and straightforward.
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BetaWhile standard SQL is widely used, specific dialects like T-SQL by Microsoft SQL Server and PL/SQL by Oracle offer extensions to enhance procedural programming capabilities. SQL is known for its create, read, update and delete functions and its nonprocedural nature makes it accessible even to those with limited programming experience, often making it an easy language for beginners.
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BetaStructured Query Language (SQL) is a standardized programming language that is used to manage relational databases and perform various operations on the data in them. Initially created in the 1970s, SQL is regularly used not only by database administrators but also by developers writing data integration scripts and data analysts looking to set up and run analytical queries.
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BetaSQL is the programming language for relational databases (explained below) like MySQL, Oracle, Sybase, SQL Server, Postgre, etc. Other non-relational databases (also called NoSQL) databases like MongoDB, DynamoDB, etc. do not use SQL. Although there is an ISO standard for SQL, most of the implementations slightly vary in syntax.
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BetaFields in SQL. Fields are basically columns in a table with specific information about the data. Consider the snapshot below. There is an e_salary field in the table that provides information about the salaries of different employees.
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BetaAn SQL developer must decide what type of data that will be stored inside each column when creating a table. The data type is a guideline for SQL to understand what type of data is expected inside of each column, and it also identifies how SQL will interact with the stored data.
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