{"id": "changelog:alter-table-support-for-create-insert-upsert-and-update", "page": "changelog", "ref": "alter-table-support-for-create-insert-upsert-and-update", "title": "Alter table support for create, insert, upsert and update", "content": "The  JSON write API  can now be used to apply simple alter table schema changes, provided the acting actor has the new  alter-table  permission. ( #2101 ) \n                 The only alter operation supported so far is adding new columns to an existing table. \n                 \n                     \n                         The  /db/-/create  API now adds new columns during large operations to create a table based on incoming example  \"rows\" , in the case where one of the later rows includes columns that were not present in the earlier batches. This requires the  create-table  but not the  alter-table  permission. \n                     \n                     \n                         When  /db/-/create  is called with rows in a situation where the table may have been already created, an  \"alter\": true  key can be included to indicate that any missing columns from the new rows should be added to the table. This requires the  alter-table  permission. \n                     \n                     \n                         /db/table/-/insert  and  /db/table/-/upsert  and  /db/table/row-pks/-/update  all now also accept  \"alter\": true , depending on the  alter-table  permission. \n                     \n                 \n                 Operations that alter a table now fire the new  alter-table event .", "breadcrumbs": "[\"Changelog\", \"1.0a9 (2024-02-16)\"]", "references": "[{\"href\": \"https://github.com/simonw/datasette/issues/2101\", \"label\": \"#2101\"}]"}