📌  相关文章
📜  sql 检查列中的重复值 - SQL 代码示例

📅  最后修改于: 2022-03-11 15:05:06.254000             🧑  作者: Mango

代码示例3
SELECT columnName, COUNT(columnName)
FROM tableName
GROUP BY columnName
HAVING COUNT(columnName)>1