Each value stored in an SQLite database (or manipulated by the database engine) has one of the following storage classes:

• NULL. The value is a NULL value.
• INTEGER. The value is a signed integer, stored in 1, 2, 3, 4, 6, or 8 bytes depending on the magnitude of the value.
• REAL. The value is a floating point value, stored as an 8-byte IEEE floating point number.
• TEXT. The value is a text string, stored using the database encoding (UTF-8, UTF-16BE or UTF-16LE).
• BLOB. The value is a blob of data, stored exactly as it was input.

Note that a storage class is slightly more general than a datatype. The INTEGER storage class, for example, includes 6 different integer datatypes of different lengths. This makes a difference on disk. But as soon as INTEGER values are read off of disk and into memory for processing, they are converted to the most general datatype (8-byte signed integer). And so for the most part, "storage class" is indistinguishable from "datatype" and the two terms can be used interchangeably.

Any column in an SQLite version 3 database, except an INTEGER PRIMARY KEY column, may be used to store a value of any storage class.

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ResourcesSqlite.org: Datatypes In SQLite Version 3