The difference between the expression and the function?
Could someone please explain me the technical difference? For example, I know CAST is an expression and To_CHAR would be a function, but what differentiates the expressions of functions?
Hello
2776946 wrote:
Could someone please explain me the technical difference? For example, I know CAST is an expression and To_CHAR would be a function, but what differentiates the expressions of functions?
What is the difference between a bird and an OWL? An OWL is a special type of a bird. All owls birds, but not all birds are fun.
Similarly, a function is a particular type of expression. All functions are expressions, nut not all expressions are functions.
In fact, the CAST is a function, but you're not wrong when you say "CAST is an expression.
Maybe you wanted to say, not MOUNT. CASE expressions are expressions, but not the functions.
The technical difference between the functions and the other types of expressions has to do with how they are being implemented and is not all that important to users. Is DECODE function? It depends on which version you use. The Oracle 6, it was a function; in Oracle 8, it wasn't; Since Oracle 9 it is again a function. I don't know what has changed; Maybe the documentation.
Tags: Database
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