The title of the article is "Checking for Duplicate Data in MySQL Tables". The article provides a query to select a field from a table and count the number of occurrences of each value. It then filters the results to only show values that have a count greater than 1, indicating the presence of duplicate data. The article was published on April 23, 2022, and does not have any tags or features specified.
select 字段,count(*) as count from 数据表 group by 字段 having count>1;
Ownership of this post data is guaranteed by blockchain and smart contracts to the creator alone.