- The disk space allocated to a data file is logically divided into pages which is the fundamental unit of data storage in SQL Server. A database page is an 8 KB chunk of data. When you insert any data into a SQL Server database, it saves the data to a series of 8 KB pages inside the data file.
- A driver also returns the SQL data types when describing the data types of columns and parameters through calls to SQLColAttribute, SQLColumns, SQLDescribeCol, SQLDescribeParam, SQLProcedureColumns, and SQLSpecialColumns.
- Sql Data Typesaskfasr Query
- Sql Data Typesaskfasr Data
- Sql Data Typesaskfasr Example
- Sql Data Types
- Sql Server Data Types
Mar 07, 2018 Microsoft SQL Server is a relational database management systems (RDBMS) that, at its fundamental level, stores the data in tables. The tables are the database objects that behave as containers for the data, in which the data will be logically organized in rows and columns format.
SQL Data Types Each column in a database table is required to have a name and a data type. An SQL developer must decide what type of data that will be stored inside each column when creating a table. SQL Data Types important points. Not all data types are supported by every relational database vendors. 13third grade james test papers. For example, Oracle database doesn’t support DATETIME and MySQL doesn’t support CLOB data type. So while designing database schema and writing sql queries, make sure to check if the data types are supported or not.
Summary: in this tutorial, you will learn about SQL Server data types including numeric, character string, binary string, date & time, and other data types.
SQL Server data types Overview
In SQL Server, a column, variable, and parameter holds a value that associated with a type, or also known as a data type. A data type is an attribute that specifies the type of data that these objects can store. It can be an integer, character string, monetary, date and time, and so on.
SQL Server provides a list of data types that define all types of data that you can use e.g., defining a column or declaring a variable.
The following picture illustrates the SQL Server data types system:
Sql Data Typesaskfasr Query
Notice that SQL Server will remove ntext, text, and image data types in its future version. Therefore, you should avoid using these data types and use nvarchar(max), varchar(max), and varbinary(max) data types instead.
Exact numeric data types
Sql Data Typesaskfasr Data
Exact numeric data types store exact numbers such as integer, decimal, or monetary amount.
- The bit store one of three values 0, 1, and NULL
- The int, bigint, smallint, and tinyint data types store integer data.
- The decimal and numeric data types store numbers that have fixed precision and scale. Note that decimal and numeric are synonyms.
- The money and smallmoney data type store currency values.
The following table illustrates the characteristics of the exact numeric data types:
Approximate numeric data types
Sql Data Typesaskfasr Example
The approximate numeric data type stores floating point numeric data. They are often used in scientific calculations.
Date & Time data types
The date and time data types store data and time data, and the date time offset.
If you develop a new application, you should use the time, date, datetime2 and datetimeoffset data types. Because these types align with the SQL Standard and more portable. In addition, the time, datetime2 and datetimeoffset have more seconds precision and datetimeoffset supports time zone.
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Character strings data types
Character strings data types allow you to store either fixed-length (char) or variable-length data (varchar). The mechanicmotorcycle mechanic blog websites. The text data type can store non-Unicode data in the code page of the server.
Unicode character string data types
Unicode character string data types store either fixed-length (nchar) or variable-length (nvarchar) Unicode character data.
Binary string data types
The binary data types stores fixed and variable length binary data.
Sql Data Types
Other data types
In this tutorial, you have learned about the brief overview of SQL Server data types. We will examine each data type in detail in the next tutorials.
Sql Server Data Types
| Data type | Length | Description |
|---|---|---|
| bigint | 8 | Integer from -2^63 (-9 223 372 036 854 775 808) to 2^63-1 (9 223 372 036 854 775 807) |
| int | 4 | Integer from -2^31 (-2 147 483 648) to 2^31-1 (2 147 483 647) |
| smallint | 2 | Integer from -2^15 (-32 768) to 2^15-1 (32 767) |
| tinyint | 1 | Integer from 0 to 255 |
| bit | 1 bit | Integer 0 or 1. |
| decimal(precision, scale) | 5-17 | Numeric data type with fixed precision and scale (accuracy 1-38, 18 by default and scale 0-p, 0 by default). |
| numeric | 5-17 | Same as data type 'decimal'. |
| money | 8 | Financial data type from -2^63 (-922 337 203 685 477.5808) to 2^63-1 (922 337 203 685 477.5807) with the precision of one ten-thousandth unit. |
| smallmoney | 4 | Financial data type from -2^31 (-214 748.3648) to 2^31-1 (214 748.3647) with the precision of one ten-thousandth unit. |
| float(n) | 4-8 | Numeric data type with float precision, where n is the number of mantis bits (1-24, accuracy of 7 digits, size of 4 bytes and 25-53, accuracy of 15 digits and size of 8 bytes). |
| real | 4 | Numeric data type with float precision that is defined as a float(24). |
| datetime | 8 | Data type representing date and time from 1.1.1753 to 31.12.9999 with the precision about 3 ms. Values are rounded to .000, .003 and .007. |
| smalldatetime | 4 | Data type representing date and time from 1.1.1900 to 6.6.2079 with the precision of 1 minute. Values up to 29.998 are rounded down and values from 29.999 are rounded down to the nearest minute. |
| char | n | Text string of fixed length (maximum length: 8000 characters) |
| varchar | n | Text string of variable length (maximum length: 8000 characters) |
| text | n | Text string of variable length (maximum length: 2^31-1 = 2 147 483 647 characters) |
| nchar | 2*n | Unicode text string of fixed length (maximum length: 4000 characters) |
| nvarchar | 2*n | Unicode text string of variable length (maximum length: 4000 characters) |
| ntext | 2*n | Unicode text string of variable length (maximum length: 2^30-1 = 1 073 741 823 characters) |
| binary | n+4 | Binary data of fixed length (maximum length: 8000 bytes) |
| varbinary | n+4 | Binary data of variable length (maximum length: 8000 bytes) |
| image | n | Binary data of variable length (maximum length: 2^31-1 = 2 147 483 647 bytes) |
| cursor | For storing the reference to cursors in a variable or in a procedure (no for CREATE TABLE). | |
| sql_variant | For storing value of another type (no text, ntext, image, timestamp, sql_variant) of max. length to 8016 bytes. ODBC doesn't fully support this data type. | |
| table | For storing the query result for the later usage. | |
| timestamp | 8+4 | Data type generates automatically binary numbers, unique in the database, used mostly to the rows identification. There can be only column of this data type in the table. |
| uniqueidentifier | Data type for storing GUID (new by means of the NEWID function or existing from the string in the form xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx, for example 6F9619FF-8B86-D011-B42D-00C04FC964FF). |