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What are pragmas in SQLite?

Contents
  1. What is PRAGMA key?
  2. What is metadata in SQLite?
  3. What is PRAGMA table info?
  4. What does varchar mean in SQLite?
The PRAGMA statement is an SQL extension specific to SQLite and used to modify the operation of the SQLite library or to query the SQLite library for internal (non-table) data.


What is PRAGMA key?

PRAGMA rekey To change the key on an existing encrypted database, it must first be unlocked with the current encryption key. Once the database is readable and writeable, PRAGMA rekey can be used to re-encrypt every page in the database with a new key.

What is metadata in SQLite?

Metadata in SQLite contains information about the tables and columns in which we store data. The number of rows that an SQL statement affects is metadata. The number of rows and columns returned in a result set are metadata as well. Metadata in SQLite can be obtained using the PRAGMA command.

What is PRAGMA table info?

Description. The table_info pragma is used to query information about a specific table. The result set will contain one row for each column in the table.

What does varchar mean in SQLite?

You can declare a VARCHAR(10) and SQLite will be happy to store a 500-million character string there. And it will keep all 500-million characters intact. Your content is never truncated. SQLite understands the column type of "VARCHAR(N)" to be the same as "TEXT", regardless of the value of N.

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