Oracle數(shù)據(jù)庫中有多種方法可以檢測重復(fù)記錄,以下是一些常用的方法:
SELECT DISTINCT column1, column2
FROM table_name;
SELECT column1, column2, COUNT(*)
FROM table_name
GROUP BY column1, column2
HAVING COUNT(*) > 1;
SELECT *
FROM table_name
WHERE ROWID IN (
SELECT MIN(ROWID)
FROM table_name
GROUP BY column1, column2
HAVING COUNT(*) > 1
);
SELECT *
FROM (
SELECT column1, column2, ROW_NUMBER() OVER (PARTITION BY column1, column2 ORDER BY column1) AS rn
FROM table_name
)
WHERE rn > 1;
這些方法可以幫助您檢測Oracle數(shù)據(jù)庫中的重復(fù)記錄并采取適當?shù)拇胧┨幚硭鼈儭?/p>