在Oracle數據庫中，可以使用Decode函數對數據進行分組和統計。以下是一些利用Decode函數進行數據分組的技巧：
SELECT column1,
COUNT(DECODE(column2, 'value1', 1, 0)) AS count_value1,
COUNT(DECODE(column2, 'value2', 1, 0)) AS count_value2
FROM table_name
GROUP BY column1;
SELECT column1,
SUM(DECODE(column2, 'value1', column3, 0)) AS sum_value1,
SUM(DECODE(column2, 'value2', column3, 0)) AS sum_value2
FROM table_name
GROUP BY column1;
SELECT column1,
AVG(DECODE(column2, 'value1', column3, NULL)) AS avg_value1,
AVG(DECODE(column2, 'value2', column3, NULL)) AS avg_value2
FROM table_name
GROUP BY column1;
SELECT column1,
column2,
COUNT(DECODE(column3, 'value1', 1, 0)) AS count_value1,
COUNT(DECODE(column3, 'value2', 1, 0)) AS count_value2
FROM table_name
GROUP BY column1, column2;
通過以上技巧，可以利用Decode函數對Oracle數據庫中的數據進行高效的分組和統計。
