Conditions can have several forms, as shown in the following syntax.
If you have installed Oracle Text, then you can create conditions with the built-in operators that are part of that product, including CONTAINS, CATSEARCH, and MATCHES. For more information on these Oracle Text elements, refer to Oracle Text Reference.
The sections that follow describe the various forms of conditions. You must use appropriate condition syntax whenever condition appears in SQL statements.
You can use a condition in the WHERE clause of these statements:
DELETE
SELECT
UPDATE
You can use a condition in any of these clauses of the SELECT statement:
WHERE
START WITH
CONNECT BY
HAVING
A condition could be said to be of a logical data type, although Oracle Database does not formally support such a data type.
The following simple condition always evaluates to TRUE:
1 = 1
The following more complex condition adds the salary value to the commission_pct value (substituting the value 0 for null) and determines whether the sum is greater than the number constant 25000:
NVL(salary, 0) + NVL(salary + (salary*commission_pct, 0) > 25000)
Logical conditions can combine multiple conditions into a single condition. For example, you can use the AND condition to combine two conditions:
(1 = 1) AND (5 < 7)
Here are some valid conditions:
name = 'SMITH'
employees.department_id = departments.department_id
hire_date > '01-JAN-08'
job_id IN ('SA_MAN', 'SA_REP')
salary BETWEEN 5000 AND 10000
commission_pct IS NULL AND salary = 2100
Oracle Database does not accept all conditions in all parts of all SQL statements. Refer to the section devoted to a particular SQL statement in this book for information on restrictions on the conditions in that statement.
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