Compound expressions

A compound expression is an expression composed of multiple types of expressions.

The syntax of a compound expression is as follows:

{ (expr)
| { + | - | PRIOR } expr
| expr { * | / | + | - | || } expr
}

Where, the PRIOR operator is used for the CONNECT BY clause in a hierarchical query.

You can use any built-in function as an expression. However, inappropriate combinations of functions in compound expressions will be deprecated. For example, the LENGTH() function is inappropriate for aggregate functions.

The following examples are some valid compound expressions:

• ('WELL' || 'SMITH')

• LENGTH('OCEAN1BASE') * 17

• SORT(221) + 32

• my_func(TO_CHAR(sysdate, 'DD-MMM-YY'))