Expressions
The
Sybase CEP is capable of utilizing a variety of expression components.
- General CCL Expressions
An expression is a combination of one or more values, operators, and Sybase functions that evaluate to a value. An expression generally assumes the data type of its components.
- Simple CCL Expressions
A simple CCL expression specifies a column, constant, or NULL.
- Compound CCL Expressions
A compound CCL expression is a combination of simple or compound expressions.
- Sybase CEP Function Expressions
Sybase CEP functions that are predefined can be used as an expression.
- IF Expressions
IF expressions are conditions that can are used in an expression or are expressions.
- CASE expression
Used as an expression. If WHEN is true it will then perform the corresponding THEN expression.
- CCL Subqueries in Expressions
It is useful to use a value in an expression that gets computed by a separate continuous query.
- Null Values in Expressions
Null values do not always provide a result that is null, in a logical expression the result might be a non-Null.
Created April 28, 2011. Send feedback on this help topic to Sybase Technical Publications:
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