To record missing or unknown values, users of relational databases can assign NULL markers as a value to columns. NULL is not a data value but a marker representing the absence of a value. NULL ...

IS NULL and IS MISSING are predicates that test for a missing value. IS NULL and IS MISSING are used in the WHERE, ON, and HAVING expressions. Each predicate resolves to true if the sql-expression's ...

A Fokus solicitou que filtrássemos apenas as pessoas que têm NULL (NULO) na DataTermino, ou seja, pessoas que atualmente ocupam o cargo listado na nossa tabela. Como podemos fazer filtrar apenas as ...