SQL was developed at IBM by Donald D. Chamberlin and Raymond F. Boyce in the early 1970s. This version, initially called SEQUEL (Structured English Query Language), was designed to …

The different between inner join and full outer join is that, Inner join compares, combines and return all output of all matched rows from both the tables (i.e if there is the common fields …

Sep 18, 2024 · This particular relationship might be one-to-one at the moment, but may very likely not be in the future. It's very common for a professor to mentor multiple students. Such …

Jun 6, 2020 · Training data is mostly of the write-once, read-bulk kind, which can be handled with flat files easily. Even appending new data to existing files is absolutely no problem. As long as …

The SQL specification doesn't state the specific order that records are to be returned, so it's going to be implementation dependent. With no indexes on the table, the sensible order would be …

In SQL, it's a nullable field, which means it's not known. I can't think of any reasonable business value in storing an empty string in a table other than simply bad design. It's like storing a string …

39 QUESTION: Why is SQL's BETWEEN inclusive? ANSWER: Because the SQL language designers made a poor design decision, in that they failed to deliver syntax that would allow …

In a typical scenario, an object that needs to be persisted in the database will be created in application code without an identifier, and later saved to a table in the database. Some …

So i have to store daily attendance of employees of my organisation from my application . The part where I need some help is, the efficient way to store attendance data. After some …

Jul 21, 2023 · A minor frame challenge: your question does not seem to be "when is three-valued logic useful?" but rather "when is the specific flavor of three-valued logic that SQL uses …