How to get latest ID number in a table?

*爱你&永不变心* 提交于 2019-12-02 04:15:38

问题


How can I get the latest ID in a table?


回答1:


SELECT id FROM table ORDER BY id DESC LIMIT 1 should work as well




回答2:


If you mean the latest generated ID from an insert statement with an auto-increment column, then mysql_insert_id() should help ya out




回答3:


SELECT max(id) FROM table




回答4:


IF you've just inserted into a table with auto_increment you can run right after your query.

SELECT last_insert_id();

Otherwise the max(id) FROM table




回答5:


If the table has an auto_increment column defined - you can check by looking for "auto_increment" in the output from DESC your_table, use:

mysql_insert_id

Otherwise, you have these options:

SELECT MAX(id) FROM your_table
SELECT id FROM your_table ORDER BY id LIMIT 1



回答6:


If there are no inserts being done on a table, then SELECT MAX(ID) should be fine. However, every database has a built-in function to return the most recently created primary key of a table after an insert has been performed. If that's what you're after, don't use MAX().

http://www.iknowkungfoo.com/blog/index.cfm/2008/6/1/Please-stop-using-SELECT-MAX-id




回答7:


Also, for the id of the last record inserted, if you're using MySQLi, it would look like this:

$mysqli->insert_id

http://php.net/manual/en/mysqli.insert-id.php



来源:https://stackoverflow.com/questions/3118714/how-to-get-latest-id-number-in-a-table

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