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Decide whether a rebuild is necessary
SQLite supports a limited set of direct ALTER TABLE operations. If the deployed SQLite version supports the requested change directly, evaluate that option first. A rebuild is the generalized approach for changes such as altering column order or datatype, or adding or removing constraints when the required change is not supported directly.
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A rebuild gives you control over the new table definition, but you must explicitly copy data and reconstruct dependent schema objects. The number of indexes, triggers, and views to review, whether columns need remapping, and how foreign keys are handled all affect the migration.
Rebuild the table in the documented order
For a table named X, SQLite’s generalized procedure is a sequence, not a single ALTER TABLE command. Follow the order carefully; the official guide says to reconstruct indexes, triggers, and views associated with table X using CREATE INDEX, CREATE TRIGGER, and CREATE VIEW.
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- Record whether foreign keys are enabled. If enforcement was on, run
PRAGMA foreign_keys=OFFbefore beginning the transaction. - Start a transaction. Use the transaction to keep the replacement work and schema changes together.
- Save dependent schema definitions. Before dropping
X, inspect its associated schema SQL. SQLite gives this query as an example:SELECT type, sql FROM sqlite_schema WHERE tbl_name='X';Save the results so you can recreate the objects after the replacement table is in place. - Create a replacement table. Define
new_Xwith the intended schema. Choose a temporary name that does not collide with an existing table. - Copy the intended data. For unchanged layouts, a simple form is
INSERT INTO new_X SELECT ... FROM X;. When columns have moved, been added, or otherwise changed, specify source and destination columns explicitly so values land in the correct fields. - Drop the original table. Run
DROP TABLE Xonly after its associated definitions have been saved and the replacement populated. - Give the replacement the original name. Rename
new_XtoX. - Recreate indexes and triggers. Use the saved SQL as a starting point, adapting it to the revised table structure where necessary.
- Rebuild affected views. Drop and recreate views whose table or column references are affected by the schema change.
- Check foreign keys before commit. If they were originally enabled, run
PRAGMA foreign_key_checkand address any reported violations before committing. - Commit, then restore enforcement. Commit the transaction; if foreign keys were originally enabled, run
PRAGMA foreign_keys=ONafterward.
Why indexes, triggers, and views must be reconstructed
Dropping the old table removes its associated indexes and triggers, so do not assume they survive a drop-and-recreate migration. The saved SQL lets you rebuild them after the replacement has its final name. Review each definition against the new columns, constraints, and intended behavior rather than replaying it blindly.
Views can depend on the table even though they are not table-owned objects. If a changed name or column makes a view definition stale, drop and recreate that view as part of the migration. SQLite’s ALTER TABLE documentation includes views in the reconstruction guidance.
Handle foreign keys and DROP TABLE carefully
SQLite’s documented rebuild sequence disables foreign-key enforcement before the transaction when it was initially enabled, then checks constraints before commit and restores enforcement afterward. Keep that ordering: changing PRAGMA foreign_keys after the transaction has started is not the documented procedure.
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PRAGMA foreign_key_check reports foreign-key violations; it does not repair them. SQLite documents its behavior in the PRAGMA reference. Inspect the result and resolve violations before committing.
Account for SQLite rename-version differences
Reference rewriting during table renames depends on SQLite version and the legacy_alter_table setting. SQLite documents that trigger-body and view-definition references are updated beginning with version 3.25.0 (2018-09-15). Foreign-key references are converted beginning with version 3.26.0 (2018-12-01), unless PRAGMA legacy_alter_table=ON is used.
Check the SQLite version and relevant setting in the environment where the migration runs, not just the version on a development machine. Even where SQLite rewrites references automatically, inspect dependent definitions as part of migration review. See SQLite’s rename behavior notes.
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Pre-commit review
- Was the original table’s schema SQL captured before the drop?
- Does the copy statement map each old value to the intended new column?
- Were all required indexes and triggers recreated against the final table name?
- Were views with affected references dropped and recreated?
- If foreign keys were originally enabled, did
PRAGMA foreign_key_checkreport no unresolved violations before commit? - Were rename-version behavior and
legacy_alter_tableconsidered for the deployed SQLite runtime?
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