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Oracle and IBM Db2 provide a construct explicitly named CLOB, [1] [2] and the majority of other database systems support some form of the concept, often labeled as text, memo or long character fields. CLOBs usually have very high size-limits, of the order of gigabytes. The tradeoff for the capacity is usually limited access methods.
Varchar fields can be of any size up to a limit, which varies by databases: an Oracle 11g database has a limit of 4000 bytes, [1] a MySQL 5.7 database has a limit of 65,535 bytes (for the entire row) [2] and Microsoft SQL Server 2008 has a limit of 8000 bytes (unless varchar(max) is used, which has a maximum storage capacity of 2 gigabytes). [3]
Each column in an SQL table declares the type(s) that column may contain. ANSI SQL includes the following data types. [14] Character strings and national character strings. CHARACTER(n) (or CHAR(n)): fixed-width n-character string, padded with spaces as needed; CHARACTER VARYING(n) (or VARCHAR(n)): variable-width string with a maximum size of n ...
The Null marker indicates the absence of a value, and is distinct from a value of 0 for an integer column or an empty string for a text column. The concept of Nulls enforces the 3-valued-logic in SQL, which is a concrete implementation of the general 3-valued logic. [12]
CHARACTER_LENGTH SQL-2023 ... SQL Server: Teradata COLUMN_VALUE ... Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; ...
64 KB (text) 64 bits 1000 9999 64 [74] Microsoft Access (JET) 2 GB 2 GB 16 MB 255 64 KB (memo field), 1 GB ("OLE Object" field) 255 B (text field) 32 bits 0100 9999 64 Microsoft Visual Foxpro: Unlimited 2 GB 65,500 B 255 2 GB 16 MB 32 bits 0001 9999 10 Microsoft SQL Server: 524,272 TB (32 767 files × 16 TB max file size) 16ZB per instance ...
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The type and length are fixed in size (typically 1–4 bytes), and the value field is of variable size. These fields are used as follows: Type A binary code, often simply alphanumeric, which indicates the kind of field that this part of the message represents; Length The size of the value field (typically in bytes); Value