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Feb 17, 2021 · SELECT. SELECT is probably the most commonly-used SQL statement. You'll use it pretty much every time you query data with SQL. It allows you to define what data you want your query to return. For example, in the code below, we’re selecting a column called name from a table called customers. SELECT name FROM customers;
SQL. Tutorial. SQL is a standard language for storing, manipulating and retrieving data in databases. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems.
Usage example
SELECT * FROM Customers;- SQL basics. We'll show you the basics of creating tables and selecting data in various different ways. Welcome to SQL. (Opens a modal) Creating a table and inserting data.
- More advanced SQL queries. Learn how to perform more advanced SQL queries using AND/OR, IN, LIKE, HAVING, and more. More complex queries with AND/OR.
- Relational queries in SQL. Learn how to store related data in multiple tables and use joins to bring them together (inner joins, outer joins, and self joins).
- Modifying databases with SQL. Learn how to update data, delete data, and change table schemas with SQL commands UPDATE, DELETE, ALTER, and DROP. Using SQL to update a database.
Structured Query Language (SQL) (/ ˌ ɛ s ˌ k juː ˈ ɛ l / S-Q-L, sometimes / ˈ s iː k w əl / "sequel" for historical reasons), is a domain-specific language used in programming and designed for managing data held in a relational database management system (RDBMS), or for stream processing in a relational data stream management system (RDSMS).
- ISO/IEC JTC 1 (Joint Technical Committee 1) / SC 32 (Subcommittee 32) / WG 3 (Working Group 3)
- SQL:2016, / December 2016; 6 years ago
- ALTER TABLE. ALTER TABLE changes the structure of a table. Here is how you would add a column to a database: ALTER TABLE table_name ADD column_name datatype;
- CHECK. The CHECK constraint is used to limit the value range that can be placed in a column. If you define a CHECK constraint on a single column it allows only certain values for this column.
- WHERE. (AND, OR, IN, BETWEEN, and LIKE) The WHERE clause is used to limit the number of rows returned. As an example, first we will show you a SELECT statement and results without a WHERE statement.
- UPDATE. To update a record in a table you use the UPDATE statement. Use the WHERE condition to specify which records you want to update. It is possible to update one or more columns at a time.
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