The data type of a column defines what value the column can hold: integer, character, money, date and time, binary, and so on. SQL Data Types Each column in a database table is required to have a name and a data type.

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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.

Aug 25, 2017 · 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. The length of the resulting data type (for char, varchar, nchar, nvarchar, binary and varbinary)

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The SQL INSERT INTO Statement. The INSERT INTO statement is used to insert new records in a table. INSERT INTO Syntax. It is possible to write the INSERT INTO statement in two ways: 1. Specify both the column names and the values to be inserted:

The is_int() function checks whether a variable is of type integer or not. This function returns true (1) if the variable is of type integer, otherwise it returns false.

SQL FOREIGN KEY Constraint The FOREIGN KEY constraint is used to prevent actions that would destroy links between tables. A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in another table.

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

A number or a string that can be converted into an integer number: base: A number representing the number format. Default value: 10