This time we are looking on the crossword clue for: Empty, as a set.
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Possible Answers: NULL.
Random information on the term “NULL”:
Null (or NULL) is a special marker used in Structured Query Language (SQL) to indicate that a data value does not exist in the database. Introduced by the creator of the relational database model, E. F. Codd, SQL Null serves to fulfil the requirement that all true relational database management systems (RDBMS) support a representation of “missing information and inapplicable information”. Codd also introduced the use of the lowercase Greek omega (ω) symbol to represent Null in database theory. In SQL, NULL is a reserved word used to identify this marker.
This should not be confused with a value of 0. A null value indicates a lack of a value – a lack of a value is not the same thing as a value of zero in the same way that a lack of an answer is not the same thing as an answer of “no”. For example, consider the question “How many books does Adam own?” The answer may be “zero” (we know that he owns none) or “null” (we do not know how many he owns). In a database table, the column reporting this answer would start out with no value (marked by Null), and it would not be updated with the value “zero” until we have ascertained that Adam owns no books.