Guides/ReportDesign/15.0-Expressions-in-Izenda.md
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##15.1 Expressions Basics
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+An expression in Izenda is a SQL injection which overrides the default output of a field in favor of whatever custom SQL is placed in the query.
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In the Advanced Settings popup menu (accessed by clicking the gear icon on the right hand side of each field dialog in the Fields tab) we can see a text box called Expressions.
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![expressions1](http://wiki.izenda.us/FAQ/FAQ/expressions1.png)