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A database most often contains one or more tables. Each table is identified by a name (e.g. "Customers" or "Orders"), and contain records (rows) with data. In this tutorial we will use the well-known Northwind sample database (included in MS Access and MS SQL Server).
- SQL commands. SQL is made up of many commands. Each SQL command is typically terminated with a semicolon (;). For example, the following are two different SQL commands separated by a semicolon (;).
- Literals. Literals are explicit values which are also known as constants. SQL provides three kinds of literals: string, numeric, and binary. String literal consists of one or more alphanumeric characters surrounded by single quotes, for example
- Keywords. SQL has many keywords that have special meanings such as SELECT, INSERT, UPDATE, DELETE, and DROP. These keywords are the reserved words, therefore, you cannot use them as the name of tables, columns, indexes, views, stored procedures, triggers, or other database objects.
- Identifiers. Identifiers refer to specific objects in the database such as tables, columns, indexes, etc. SQL is case-insensitive with respect to keywords and identifiers.
Jul 24, 2024 · SQL syntax is a well-defined set of rules and guidelines that must be followed when writing SQL queries. These rules ensure that queries are interpreted correctly by the database management system (DBMS). SQL is case-insensitive, meaning keywords can be written in either uppercase or lowercase.
SQL syntax. The syntax of the SQL programming language is defined and maintained by ISO/IEC SC 32 as part of ISO/IEC 9075. This standard is not freely available. Despite the existence of the standard, SQL code is not completely portable among different database systems without adjustments.
What is SQL – give you a brief overview of the SQL language and its popular dialects. SQL Syntax – provide you with the syntax of the SQL language. SQL Sample Database – introduce you to an HR sample database.
Sep 8, 2022 · In today’s article, we’ll give you a walkthrough of core SQL syntax with a focus on the SELECT, INSERT INTO, UPDATE, and DELETE statements. SQL is a programming language designed specifically to communicate with databases.
In each tutorial, we will explain the SQL syntax structures and behaviors that are valid across the databases. We also will discuss the exceptions if they exist in a particular database. Was this tutorial helpful ? Previously. SQL Tutorial. Up Next. SQL Sample Database.
