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Meshes - Result of a Path Extension
A path extension with the syntax
..._assoc1[ [ cond] ] _assoc2[ [cond] ] ...
describes a set of rows in the last path node.
Other versions:
7.31 | 7.40 | 7.54
Result when used in a loop
Each mesh association specified in a mesh path with path extension describes a set of rows in its follow-on node. This set is used as a starting point for their follow-on nodes of the rows and meets the following conditions:
- All rows meet the
ONcondition of the mesh association used with respect to the set of rows described in the preceding mesh association. Everytcompcolumn specified in theONcondition has the same content as in thescompcolumn (of the root node a row of its result) assigned to theONcondition.
- Depending on the mesh path usage, the set of
rows can be further restricted by using additional
condconditions.
In the set of rows described by a path extension, each row occurs only once, even if it was found more than once in the evaluation of the mesh path.
Result when used in a table expression
Each mesh association specifiedin a mesh path with path extension selects a single row in its follow-on node (or fails by raising an exception). This row is used as the starting point for the follow-on node in accordance with the conditions described above.
Note
The set of rows described by the result can be either one single row or multiple rows.