在Oracle查詢中,可以使用以下方法來靈活判空:
SELECT * FROM table_name WHERE column_name IS NULL;
SELECT * FROM table_name WHERE column_name IS NOT NULL;
SELECT NVL(column_name, 'default_value') FROM table_name;
SELECT CASE WHEN column_name IS NULL THEN 'null_value' ELSE column_name END FROM table_name;
SELECT COALESCE(column1, column2, column3) FROM table_name;
通過以上方法,在Oracle查詢中可以靈活地判空并處理空值情況。