Sql 删除关系表中的重复行

我在

PostgreSQL

数据库中有一个关系表。 我想删除重复的行

我的桌子看起来像这样：

idUser      idFunction
1           1
2           1
3           1
3           1
4           1
4           1
4           2

我想要这个：

idUser      idFunction
1           1
2           1
3           1
4           1
4           2

我已经试过了：

DELETE TOP (SELECT COUNT(*) -1 FROM user_function 
        WHERE idUser IN
            (SELECT idUser FROM user_function
            GROUP BY idUser, idFunction
            HAVING COUNT(*) > 1)
        AND idFunction IN
            (SELECT idFunction FROM user_function
            GROUP BY idUser, idFunction
            HAVING COUNT(*) > 1))
FROM user_function
WHERE idUser IN
    (SELECT idUser FROM user_function
    GROUP BY idUser, idFunction
    HAVING COUNT(*) > 1)
AND idFunction IN
    (SELECT idFunction FROM user_function
    GROUP BY idUser, idFunction
    HAVING COUNT(*) > 1)

但是

PostgreSQL

告诉我在“TOP”中有一个

错误

如何在
PostgreSQL
中删除关系表中的重复行？
我建议重新创建该表：

create table temp_user_function as
    select distinct idUser, idFunction
    from user_function;

truncate table user_function;   -- backup first!!!

insert into user_function (idUser, idFunction)
    select idUser, idFunction
    from temp_user_function;

修复数据后，应将该对声明为唯一的。
我建议只重新创建表：

create table temp_user_function as
    select distinct idUser, idFunction
    from user_function;

truncate table user_function;   -- backup first!!!

insert into user_function (idUser, idFunction)
    select idUser, idFunction
    from temp_user_function;

修复数据后，应将该对声明为唯一的