SQL Escape Sequences for .NET
A number of language features, such as outer joins and scalar function calls, are commonly implemented by DBMSs. The syntax for these features is often DBMS-specific, even when a standard syntax has been defined. .NET supports escape sequences that contain standard syntaxes for the following language features:
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Date, time, and timestamp literals
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Scalar functions such as numeric, string, and data type conversion functions
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Outer joins
The escape sequence used by .NET is:
{extension}
The escape sequence is recognized and parsed by the PSQL ADO.NET Data Provider, which replaces the escape sequences with data store-specific grammar.