SQL Data Types for MySQL, SQL Server, and MS Access - W3Schools
An 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 …
MySQL Data Types - W3Schools
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. In MySQL there are …
SQL Tutorial - W3Schools
Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems. Start learning SQL now » Examples …
Date Functions in SQL Server and MySQL - W3Schools
SQL Server comes with the following data types for storing a date or a date/time value in the database: DATE - format YYYY-MM-DD; DATETIME - format: YYYY-MM-DD HH:MI:SS; …
SQL Examples - W3Schools
Examples might be simplified to improve reading and learning. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all …
SQL ALTER TABLE Statement - W3Schools
Change Data Type Example. Now we want to change the data type of the column named "DateOfBirth" in the "Persons" table. We use the following SQL statement:
SQL Server CONVERT() Function - W3Schools
Optional. The length of the resulting data type (for char, varchar, nchar, nvarchar, binary and varbinary) expression: Required. The value to convert to another data type: style: Optional. …
Introduction to SQL - W3Schools
What is SQL? SQL stands for Structured Query Language; SQL lets you access and manipulate databases; SQL became a standard of the American National Standards Institute (ANSI) in …
SQL Stored Procedures for SQL Server - W3Schools
A stored procedure is a prepared SQL code that you can save, so the code can be reused over and over again. So if you have an SQL query that you write over and over again, save it as a …
SQL Keywords Reference - W3Schools
Copies data from one table into a new table: SELECT TOP: Specifies the number of records to return in the result set: SET: Specifies which columns and values that should be updated in a …