Question: I have a table: Now I want to make the columns user, email, address unique (together). How do I do this in MySql? Of course the example is just… an example. So please don’t worry about the semantics. Best ...

Question: I am currently working on a project where I want to store a connection between two users and some additional information in a SQLite database. The problem is that I want to store this connection exactly once and not ...

Question: In Postgres, Unique key contraint error is thrown when we try to re-insert record with same combination of unique key. But in Snowflake, error is not thrown and duplicates are allowed (even after adding ENFORCED keyword in query) DB ...

Question: I’m trying to do an insert into table if the table doesn’t already contain a field with a specified value. For this I am using this command: INSERT INTO zyprexa (NULL,'hello',0,0,0) SELECT date WHERE NOT EXISTS (SELECT 1 FROM ...