Spread the loveNULL in SQL is a powerful concept, representing the absence of a value. It’s used when data is unavailable or unknown, but its usage requires careful consideration. The first step is ...

The value (or non-value) null can be the bane of a programmer’s existence. Null can work as expected in one language and context, then act in completely unexpected ways in another language or context.

The lack of information within relational databases expressed as NULL values presents a problem in ensuring the quality of data and the information retrieved by SQL queries. This is so because there ...