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The SQLite database presents a challenge to migration tools
-in that it has almost no support for the ALTER statement
+in that it has almost no support for the ALTER statement which
relational schema migrations rely upon. The rationale for this stems from
philosophical and architectural concerns within SQLite, and they are unlikely
to be changed.
Note that also as is the case with SQLite, CHECK constraints need to be
moved over between old and new table manually using the
:paramref:`.Operations.batch_alter_table.table_args` parameter.
-