create-table --sql option for CREATE TABLE AS SELECT - #846
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Closes #481.
This adds a --sql option to create-table so you can populate a new table from a query without having to drop into sqlite3 or run the CREATE TABLE ... AS SELECT by hand:
The columns come from the query, so --sql can't be combined with column definitions or with --pk/--not-null/--default/--fk/--transform/--strict - each of those raises a clear error if you pass them alongside it. --ignore and --replace both work the same way they do for the normal create-table, and I kept the existing 'table already exists' behaviour so nothing changes for people not using --sql.
Docs and the cog-generated CLI reference are updated, and there are tests covering the happy path plus all the option-conflict and already-exists cases.
📚 Documentation preview 📚: https://sqlite-utils--846.org.readthedocs.build/en/846/