MySQL Data Types (Version 8.0) In MySQL there are three main data types: string, numeric, and date and time. String Data Types

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 three main data types: string, numeric, and date and time.

data_type: Required. The datatype to convert expression to. Can be one of the following: bigint, int, smallint, tinyint, bit, decimal, numeric, money, smallmoney, float, real, datetime, smalldatetime, char, varchar, text, nchar, nvarchar, ntext, binary, varbinary, or image (length) Optional.

SQL ALTER TABLE Statement. The ALTER TABLE statement is used to add, delete, or modify columns in an existing table. The ALTER TABLE statement is also used to add and drop various constraints on an existing table.

Data types are divided into two groups: Primitive data types - includes byte, short, int, long, float, double, boolean and char; Non-primitive data types - such as String, Arrays and Classes (you will learn more about these in a later chapter)

SQL Server has many built-in functions. This reference contains string, numeric, date, conversion, and some advanced functions in SQL Server. SQL Server String Functions

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 in Each Chapter

Aug 25, 2017 · The CAST() function converts a value (of any type) into a specified datatype. Tip: Also look at the CONVERT() function. Syntax

A string (or a text string) is a series of characters like "John Doe". Strings are written with quotes. You can use single or double quotes:

Strings. The string data type is used to store a sequence of characters (text). String values must be surrounded by double quotes: