Constraints are part of a database schema definition. A constraint is usually associated with a table and is created with a CREATE CONSTRAINT or CREATE ASSERTION SQL statement. They define certain properties that data in a database must comply with. They can apply to a column, a whole table, more than one table or an entire schema. A reliable … Read more
As the error message tells you – you can not have two rows with the same value in the columns dementia_type, snapid since they need to be unique. You have to make sure that the two databases has the same values for dementia_type, snapid. A workaround would be to add a column to your table alter table t_types_of_dementia add … Read more
If you have a table called memos that has two columns id and text you should be able to do like this: If a record already contains a row where text is equal to ‘text to insert’ and id is equal to 5, then the insert operation will be ignored. I don’t know if this will work for your particular query, but perhaps … Read more