更新PHP Mysql表的最后10条记录

Question

It seems a simple question but unfortunately I can't find examples.

Suppose that I want use the UPDATE sentence into php for updating the last 10 records of my table "users" of Database "users". what its the code for that? I mean INSERT sentence have a
answer for that using LIMIT etc, but UPDATE dont have it.

Thanks in advance for your help.

pd: For example, I want to update "Firstname" field with "michael" word in the last 10 records.

Answer 1

Try this

UPDATE table SET notes="hi"
ORDER BY id DESC
LIMIT 10

As per Mysql docs, if there is a unique column, order by it DESC, and use LIMIT 10 to select last 10 records.

UPDATE [LOW_PRIORITY] [IGNORE] table_reference
        SET col_name1={expr1|DEFAULT} [, col_name2={expr2|DEFAULT}] ...
        [WHERE where_condition]
        [ORDER BY ...]
        [LIMIT row_count]

Answer 2

You can do something like this.

Method 1

UPDATE table_name SET column_name='value' WHERE id IN (SELECT id FROM table_name ORDER BY id desc LIMIT 0, 10);

Method 2

If you look at the docs

UPDATE [LOW_PRIORITY] [IGNORE] table_reference
    SET col_name1={expr1|DEFAULT} [, col_name2={expr2|DEFAULT}] ...
    [WHERE where_condition]
    [ORDER BY ...]
    [LIMIT row_count]

Which means below also should work for you

UPDATE table_name SET column_name='value' ORDER BY id desc LIMIT 10;

Try one of them which suits you and let me know if you have any issues.

Answer 3

您没有向表模式提供任何输入，但这里有一些可行的方法：

UPDATE users SET firstname='michael' WHERE id >= (SELECT MAX(id)-10 FROM users);