Jul 15, 2021 · 6 This question considers whether SQL DB data should be represented as an enum or by a reference table, when the application code is aware of particular instances of …

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 …

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 …

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 …

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 …

Person_First_Name or maybe even Person_Person_First_Name (don't ask me why you see person 2x) Why is it considered a bad practice to pre-fix column names? Are underscores …

4 row=record in relational databases, those are just two terms for the same thing "SELECT" statements (not all SQL statements) deliver a result set consisting of rows or records, …

Representing geographical locations within an application, the design of the underlying data model suggests two clear options (or maybe more?). One table with a self referencing …

Apr 14, 2016 · I am working on Android with the query() method of the ContentResolver class and it accepts 6 parameters, (uri,projection,selection,selectionArgs,sortOrder,cancellationSignal) …