如何删除 MySQL 表上的重复项?
我需要在 MySQL
表上DELETE
指定 sid 的重复行.
I need to DELETE
duplicated rows for specified sid on a MySQL
table.
如何使用 SQL 查询执行此操作?
How can I do this with an SQL query?
DELETE (DUPLICATED TITLES) FROM table WHERE SID = "1"
类似这样的事情,但我不知道该怎么做.
Something like this, but I don't know how to do it.
推荐答案
这会在原地删除重复项,而无需创建新表
this removes duplicates in place, without making a new table
ALTER IGNORE TABLE `table_name` ADD UNIQUE (title, SID)
注意:只有当索引适合内存时才有效
note: only works well if index fits in memory
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