What is the difference between nvarchar and Ntext?

ntext will always store its data in a separate database page, while nvarchar(max) will try to store the data within the database record itself. So nvarchar(max) is somewhat faster (if you have text that is smaller as 8 kB).

What is Ntext datatype?

Variable-length Unicode data with a maximum string length of 2^30 - 1 (1,073,741,823) bytes. Storage size, in bytes, is two times the string length that is entered. The ISO synonym for ntext is national text. text.

What is the difference between VARCHAR and NVARCHAR?

The key difference between varchar and nvarchar is the way they are stored, varchar is stored as regular 8-bit data(1 byte per character) and nvarchar stores data at 2 bytes per character. Due to this reason, nvarchar can hold upto 4000 characters and it takes double the space as SQL varchar.

What is the meaning of NVARCHAR?

The NVARCHAR data type stores character data in a variable-length field. Data can be a string of single-byte or multibyte letters, digits, and other characters that are supported by the code set of your database locale.

Why do we use NVARCHAR?

The real reason you want to use NVARCHAR is when you have different languages in the same column, you need to address the columns in T-SQL without decoding, you want to be able to see the data "natively" in SSMS, or you want to standardize on Unicode.

5 Tips to improve SQL Server performance

What is difference between nchar and VARCHAR?

nchar is fixed-length and can hold unicode characters. it uses two bytes storage per character. varchar is of variable length and cannot hold unicode characters. it uses one byte storage per character.

What is difference between TEXT and nText in SQL Server?

Text - Variable-length non-Unicode data with a maximum length of 2^31 - 1 (2,147,483,647) characters. nText - Variable-length Unicode data with a maximum length of 2^30 - 1 (1,073,741,823) characters. You can get lot of info about this in SqlServer Books online...

What is a BLOB SQL?

An SQL BLOB is a built-in type that stores a Binary Large Object as a column value in a row of a database table. By default drivers implement Blob using an SQL locator(BLOB) , which means that a Blob object contains a logical pointer to the SQL BLOB data rather than the data itself.

What is the difference between VARCHAR and TEXT in SQL Server?

Some Differences Between VARCHAR and TEXT

The VAR in VARCHAR means that you can set the max size to anything between 1 and 65,535. TEXT fields have a fixed max size of 65,535 characters. A VARCHAR can be part of an index whereas a TEXT field requires you to specify a prefix length, which can be part of an index.

Which is faster VARCHAR or NVARCHAR?

Each character of an nvarchar column requires 2 bytes of storage whereas a varchar column requires 1 byte per character. Potentially, varchar will be quicker but that may well mean that you cannot store the data that you need.

What is difference between Nchar and NVARCHAR?

The NCHAR data type is a fixed-length character data type that supports localized collation. The NVARCHAR data type is a varying-length character data type that can store up to 255 bytes of text data and supports localized collation.

How many characters is NVARCHAR 255?

nvarchar(255) (in SQL Server) stores 255 Unicode characters (in 510 bytes plus overhead).

What is binary and VARBINARY in SQL?

Binary, Varbinary & Varbinary(max) are the binary string data types in SQL Server. These data types are used to store raw binary data up to a length of (32K – 1) bytes. The contents of image files (BMP, TIFF, GIF, or JPEG format files), word files, text files, etc.

What is the max length of NVARCHAR in SQL Server?

The max size for a column of type NVARCHAR(MAX) is 2 GByte of storage. Since NVARCHAR uses 2 bytes per character, that's approx. 1 billion characters.

What is the max size of VARBINARY?

varbinary [ ( n | max) ] Variable-length binary data. n can be a value from 1 through 8,000. max indicates that the maximum storage size is 2^31-1 bytes. The storage size is the actual length of the data entered + 2 bytes.

What is a CLOB in SQL?

A CLOB (character large object) value can be up to 2,147,483,647 characters long. A CLOB is used to store unicode character-based data, such as large documents in any character set.

What is BLOB and CLOB in SQL?

The full form of Blob is a Binary Large Object. The full form of Clob is Character Large Object. This is used to store large binary data. This is used to store large textual data. This stores values in the form of binary streams.

What is enum in SQL?

An ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation time.

Is BLOB a data type in SQL?

A BLOB, or Binary Large Object, is an SQL object data type, meaning it is a reference or pointer to an object. Typically a BLOB is a file, image, video, or other large object. In database systems, such as Oracle and SQL Server, a BLOB can hold as much as 4 gigabytes.

What is Sql_variant data type?

sql_variant enables these database objects to support values of other data types. A column of type sql_variant may contain rows of different data types. For example, a column defined as sql_variant can store int, binary, and char values. sql_variant can have a maximum length of 8016 bytes.

How can I see Varbinary data in SQL Server?

INSERT INTO #TempTable(PK, VarBinaryColumn) SELECT PK, VarBinaryColumn FROM dbo. YourPermanentTable; If you need to convert the varbinary data back to the original file text format in T-SQL, you can use CAST or CONVERT to convert to varchar or nvarchar as long as the data was originally ASCII or Unicode.

When should I use NVARCHAR in SQL Server?

Use nvarchar when the sizes of the column data entries vary considerably. Use nvarchar(max) when the sizes of the column data entries vary considerably, and the string length might exceed 4,000 byte-pairs.

What is Unicode and non Unicode in SQL?

The only difference between the Unicode and the non-Unicode versions is whether OAWCHAR or char data type is used for character data. The length arguments always indicate the number of characters, not the number of bytes.

Is NVARCHAR a string?

The NVARCHAR data type stores strings of varying lengths. The string can include digits, symbols, and both single-byte and (in some locales) multibyte characters. The main difference between VARCHAR and NVARCHAR data types is the collation order.