[英]How do I fetch all records which belong to a user and show only the records with distinct name?
Tagmap.where(user_id: current_user.id).uniq(:name)
此查询似乎不起作用。 它仍然仅获取属于该用户的所有记录。
您可以使用group by SQL查询。
Tagmap.where(user_id: current_user.id).group(:name)
如何仅获取与JPA中的其他2个表具有@OneToMany关系的父记录
[英]How do I Fetch Only Parent Records which has @OneToMany Relation with 2 other tables in JPA
如何编写查询以查找不属于所选字段的记录？
[英]How to write a query to find records which do not belong the field selected?
如何仅选择列中前 50 个不同值的所有记录
[英]How to select all records for only the first 50 distinct values in a column
如何获取 mysql 中具有最大日期值的那些行的记录？
[英]How do I fetch the records of those rows which have the maximum date value in mysql?
我如何在比较列中的两个相似记录时获取徽章详细信息和用户详细信息
[英]How do i fetch Badge details and User details while comparing two similar records in a Column
如何显示不同的记录，我想检查：如果表中已经存在blueid，则该数据仅在特定日期显示一次
[英]how to display distinct records, I want to check : if blueid is already present in the table show that data only once with particular date
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