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Reserved and Contextual Keywords

Posted By: Venkat     Posted Date: February 04, 2010    Points: 2   Category :.NET Framework
Many programming languages, C# included, treat certain sequences of letters as "special".

Some sequences are so special that they cannot be used as identifiers. Let's call those the "reserved keywords" and the remaining special sequences we'll call the "contextual keywords". They are "contextual" because the character sequence might one meaning in a context where the keyword is expected and another in a context where an identifier is expected.*

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When creating a query in Microsoft Access, you might want to return only distinct or unique values. There are two options in the query's property sheet, "Unique Values" and "Unique Records":
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