Hi, I find that `UniqueConstraint` from `sqlachemy` and `op.create_unique_constraint` by `alembic`, it cannot handle multiple columns that contain null values.
I saw we can solve using SQL commands via some tricky ways like creating unique index and coalesce, do we have some ways using `sqlachemy` instead of directly using `SQL` to solve this issue? Thanks! Lydia -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
