Web Reference: How can I avoid this exception in sqlalchemy orm when I try to create a table which already exists in a database: sqlalchemy.exc.InvalidRequestError: Table 'col1' is already defined for this MetaData instance. Specify 'extend_existing=True' to redefine options and columns on an existing Table object. class Col1(Base): Mar 2, 2026 · There is also dialect-specific support for ORM-enabled “upserts”, which are INSERT statements that automatically make use of UPDATE for rows that already exist. Feb 6, 2026 · This guide will walk you through **four practical methods** to check for existing objects in a SQLAlchemy table, complete with step-by-step examples, pros/cons, and best practices.
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