What is a Boolean operator?
The most common Boolean operators are AND, OR, and NOT. For example, searching for all markers of the type Gene on Chromosome 2 is equivalent to identifying the union of the two sets: • All markers of the type Gene (Type Gene? = true) AND • All markers on Chromosome 2 (Chromosome 2 = true). Back to Top How do I use a Boolean operator on an MGI query form? MGI query forms allow you to connect search terms using two Boolean operators: AND and OR. Note: There is a NOT checkbox for some fields on the query forms. To exclude items from a search, click this box. Operator Usage AND If you enter term1 AND term2, the search locates all records containing both terms in any order. OR If you enter term1 OR term2, the search locates all records containing either term1 or term2 or both terms. NOT If you enter term1 NOT term2, the search locates all records containing term1 excluding those containing term2. Note: The NOT operator does not work at this time.–> Enclose terms in parentheses to specify
