在Oracle数据库中,可以使用以下方法去重:
SELECT DISTINCT column1, column2
FROM table_name;
SELECT *
FROM (
SELECT column1, column2, ROW_NUMBER() OVER (PARTITION BY column1, column2 ORDER BY column1) AS rn
FROM table_name
)
WHERE rn = 1;
SELECT column1, column2
FROM table_name
WHERE rowid IN (
SELECT MIN(rowid)
FROM table_name
GROUP BY column1, column2
);
这些是一些常用的去重方法,可以根据具体的需求选择合适的方法去重。