I want to create a table, with composite primary key and autoincrement, in Oracle 19c, like this: How I do it? Answer Create trigger on this table to achieve this result. Assume table name is test123
Tag: composite-primary-key
Oracle SQL Unique Constraint Violated
I need to create tables and input values. All but two rows when inserted give me an error, Unique Constraint Violated. The last row in DEPT_LOCATIONS table and the second to the last row in DEPENDENT table. I’m not sure why these rows aren’t being added because other rows in the same table are. He…
How to make separately unique each column in postgresql?
I know we can apply primary key to a column to provide uniqueness for a row and we can apply multiple primary keys and get a composite key. But this didn’t work for my case. I have userID and email columns. And I want them to be unique at the same time. When I applied primary key attribute to both
MS Access 2016, joining multiple tables with composite keys
Good Morning all, My first question, so pardon some bad form if it exists. I currently have three tables (table1, table2, table3), all of which have a composite primary key (model-number, serial-…
How can I alter a primary key constraint using SQL syntax?
I have a table that is missing a column in its primary key constraint. Instead of editing it through SQL Server, I want to put this in a script to add it as part of our update scripts. What syntax can I use to do this? Must I drop and recreate the key constraint? Answer Yes. The only way would