Appendix A: Expression Syntax
Expression Syntax: Overview
Transform queries are built using the DPL expression syntax, which is composed of data types combined within a specific grammar. The data types representvarious forms of information. The grammar - which uses literals, operators, functions, tables and columns - describes the rules that govern howexpressions must be formatted and how data types interact with each other.
(Standard queries also use the DPL expression syntax from within the Expression Editor..)
You can experiement with the expression syntax by creating transform queries within DPL's Expression Editor and previewing the results which appear in the output pane at the bottom of the editor.
Details about the various aspects of expression syntax are available under the following individual topics:
1.Data types and type conversion rules
3.Literals
6.Tables
7.Columns