Usage of else in plsql

The ELSE clause in PL/SQL specifies the alternative execution path when the condition is false in the IF-THEN-ELSE statement. The syntax is: IF condition THEN code block 1 ELSE code block 2 END IF. Its uses include specifying operations when a condition is false, handling different results, and handling special cases.

Usage of ELSE clause in PL/SQL

The ELSE clause is used in PL/SQL control statements (such as IF-THEN-ELSE) specifies an alternative execution path when the condition is false.

Syntax

<code>IF condition THEN
  -- 代码块 1 -- 如果条件为真，则执行
ELSE
  -- 代码块 2 -- 如果条件为假，则执行
END IF;</code>

Usage

The ELSE clause is used in the following situations:

• When you need to perform specific operations when conditions are not met.
• When a choice needs to be made between two or more possible outcomes.
• When you need to handle special situations where the condition is false.

Example

<code>-- 检查一个数字是否是偶数
DECLARE
  number NUMBER := 10;
BEGIN
  IF number MOD 2 = 0 THEN
    DBMS_OUTPUT.PUT_LINE('该数字是偶数。');
  ELSE
    DBMS_OUTPUT.PUT_LINE('该数字是奇数。');
  END IF;
END;</code>

Output:

<code>该数字是偶数。</code>

Note:

• The ELSE clause is optional. If not provided, control flow will continue with subsequent code execution when the condition is false.
• The ELSE clause can only be used with an IF statement.
• The ELSE clause can be nested within other IF statements.
• The ELSE clause can be used with the ELSIF clause to implement more complex branching logic.

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