SEL_OPERATOR :

Operators allowing to combine several selection criteria

Elementary selection criteria (e.g., by species, by keyword) may be logically combined to create multi-criterion queries. Multi-criterion queries can be built in one of two ways :

1. First
   • Use the Selection criteria buttons to specify each elementary criterion,
   • Complete each such step by pressing the build query button,
   • Use the Selection Operators between of before elementary criteria.

2. Second
   • Type the query in the type-in box of panel Query respecting the syntax described below.
   • When the desired query is completed, press the exec query button of panel Query or hit return.

List of operators

• Binary operators are used between two lists:

  Button     In query  Result of operation
  
  and           et     elements belonging to both lists
  or            ou     elements of either list
  but not       et no  elements of list at left but not in list at right
  

• Unary operators are used before a list:

  Button     In query  Result of operation
  
  not           no     elements not belonging to the list
  parent seqs   me     replace sequences of list by their parent(s)
  add subseqs   fi     add to list all subsequences of sequences therein
  proj species  ps     to produce the list of species from which sequences 
                       in list come
  proj keywords pk     to produce the list of keywords attached to sequences 
                       in list
  proj to seqs  un     to produce the list of sequences attached to species in
                       list for a species list or to keywords for a keyword list
  desc species  sd     to produce the list of taxa placed below taxa of list in
                       the biological classification of species
  desc keywords kd     to produce the list of keywords placed below keywords of  
                       list in the keyword tree
  

Parentheses () may be used to delimit the range of operators.

Examples : Result: sp=homo sapiens et k=hormone human hormones sp=mammalia et no o=mitochondrion mammals but not their mitochondria list2 et k=atpase combine previously defined list2 with a keyword-based criterion (sp=homo sapiens ou sp=saccharomyces cerevisiae)et o=mitochondrion

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