For example, all numbers that can be stored in an INTEGER column can be expressed as TEXT, and so a TEXT column's data may be used to reference data in an INTEGER column. Next, use the FOREIGN KEY keyword followed by a set of parentheses and specify the foreign key column or group of columns. While teaching a database basics course, a student asked about Foreign Keys whose data type does not match the data type of the thing (e.g. A foreign key in SQL is a table-level construct that constrains one or more columns in that table to only allow values that are present in a different set. I would try restoring with pgrestore with the -clean option (assuming you want to restore from the dump and not keep anything in the current db, where you are restoring to. But I think the errors are because you are not dropping and recreating the database on restore. The CONSTRAINT is optional if you skip it, Postgres will specify an auto-generated name. Im not sure about the default settings of pgdump and restore. Data in child tables will appear to exist in the parent tables, unless data is selected. Please help me solve this as I am new to postgres. Let’s comprehend the above-given syntax step-by-step: Firstly, specify the foreign key name using the CONSTRAINT keyword/clause. Tables can be set to inherit their characteristics from a parent table. Later I tried deleting the record first from "scores" table and then from "titles" table, but still it is showing me the error as above. I have tried removing the foreign key constraint on the scores table and then tried removing the records, but it didn't work. But when i run the query i am getting the below shown error.ĮRROR: update or delete on table "titles" violates foreign keyĭETAIL: Key (id_titles)=(tt3391132) is still referenced from table "scores". I have witten a query to remove old_movies, shortfilms, games, episodes from my "titles" table. I have a table "titles" and a table "scores" in DB.
0 Comments
Leave a Reply. |