selection expression
A selection expression is an expression used for selecting a subset of rows from a table or worksheet, usually based on some comparison criteria.
A selection expression is used in the value
attribute of the <sel> operation. A selection expression generally
resolves to a 0 or 1. Rows for which the expression evaluates to 1 remain in the
resultant worksheet; rows where the expression evaluates to 0 are omitted. However,
there are exceptions such as when you are using the expand or
sample attributes.
See also:
- expression
- scalar expression
- value expression
<sel>in the 1010data Reference Manual- Writing Expressions in the 1010data Reference Manual