SQLite auto-increment primary key reset method
Resetting auto-incrementing primary key values is a common problem when working with SQLite databases. This article will explore this and provide effective solutions.
Scenarios and questions
User attempted to reset auto-increment fields for multiple tables in a SQLite database. However, using the DELETE FROM
command to delete all data does not reset the field to 0. In contrast, auto-increment continues to increment from the last value after data is deleted.
Detailed explanation
This problem arises because SQLite uses a separate table named SQLITE_SEQUENCE
to keep track of the highest ROWID value in each table. When a new record is inserted, the AUTOINCREMENT algorithm checks the SQLITE_SEQUENCE
table to determine the next available primary key value.
Deleting data from the main table will only delete the associated rows. SQLITE_SEQUENCE
The table remains unchanged, causing the auto-increment counter to continue incrementing from its last value.
Solution
To reset the primary key field to the desired value, execute the following two statements:
DELETE FROM your_table; DELETE FROM sqlite_sequence WHERE name='your_table';
The first statement deletes all data in the main table. The second statement deletes the entry for that table in the SQLITE_SEQUENCE
table, effectively resetting the highest ROWID value to 0.
Other notes
- Modification of the
SQLITE_SEQUENCE
table should be done with caution. - Be sure to back up your database before making any changes.
- The solutions provided work for both manually created tables and tables created using tools like SQLite Maestro.
The above is the detailed content of How to Reset Auto-Incrementing Primary Keys in SQLite?. For more information, please follow other related articles on the PHP Chinese website!

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