In my table I have auto increment id which is having its number like 1 to 66,440 and next number is 88846790 + increment from here till 88846900.
There is no records in between 66440 to 88846790
I want my next auto increment number to be 66441 but its taking 88846791, can you help me in setting next auto increment to 66441,
alter table tablename AUTO_INCREMENT=664441
should do
You can use ALTER TABLE to change the auto_increment value:
ALTER TABLE my_table AUTO_INCREMENT = 66441;
See the MySQL reference for more details.
Remember to reinsert all rows with an id higher than 88846790
If you don't remove rows with a higher ID than 66441,
the change in autoincrement does nothing.
Example:
ID Value
---- --------
1 C
2 A
4 D
50 A
51 C
If I want to change auto increment to 5 I need to remove or re-insert the 50 and 51 first. Because otherwise the next auto increment is gonna be 52 anyway.
Depending on how much and how important the data is, often the best thing to do is: Nothing
Because those primary ID's have relations to other rows, and maybe even web- urls based opn those IDs. This will all fail, unless you create some sort of script.
I had trouble getting this to work in phpMyAdmin, even inputting the query directly. If you browse the table you want to reset the index of, then click Operations, you should be able to set the AUTO_INCREMENT directly under Table options. Then just click Go and you're all set!
Rebutal to all those recommending ALTER:
You cannot reset the counter to a value less than or equal to the
value that is currently in use. For both InnoDB and MyISAM, if the
value is less than or equal to the maximum value currently in the
AUTO_INCREMENT column, the value is reset to the current maximum
AUTO_INCREMENT column value plus one.
-- https://dev.mysql.com/doc/refman/8.0/en/alter-table.html
(That is from the 8.0 manual, but I believe that it has always applied; I think I discovered it in 4.0 days.)
Better than deleting and re-inserting:
Renumber the higher values:
UPDATE t SET id = id - 88846790 + 66440 + 1 WHERE id >= 88846790;
But then comes the hassle of renumbering references to this id. They can use a similar update:
UPDATE other_table SET t_id = t_id - 88846790 + 66440 + 1 WHERE t_id >= 88846790;
Related
I need to set each increment id +5 from the previous one generated id table wise. It means each auto-increment have to 5 number of the gap. Like this series 2,7,12,17 etc..
Any idea please share.
Please check the link:
https://dev.mysql.com/doc/refman/8.0/en/replication-options-master.html#sysvar_auto_increment_offset
SET ##auto_increment_offset=5;
SHOW VARIABLES LIKE 'auto_inc%';
CREATE TABLE autoinc2 (col INT NOT NULL AUTO_INCREMENT PRIMARY KEY);
You should not be demanding this requirement from an auto increment column. The contract of an auto increment column only guarantees that each generated value would be unique. The values would tend to generally be increasing, but if the counter were reset, and certain earlier records were deleted, there could be a value generated smaller than one which already exists. Instead, consider maintaining some sort of timestamp column which keeps track of when each record were added to your table. Then, using ROW_NUMBER, it is easy to generate the sequence you expect, e.g.
SELECT
5*ROW_NUMBER() OVER (ORDER BY ts_column) seq
FROM yourTable;
ORDER BY
ts_column;
If you need to increment by 5, you can set auto_increment_increment=5.
This will apply to all tables, so you should set it as a session variable, not a global variable. The session variable will only apply to INSERT statements made in your current session, not to other sessions.
Then change the option back to 1 before you INSERT to another table.
There is no feature in MySQL to make the auto_increment_increment option apply permanently and for all sessions, but only for a specific table.
i'm deleting previous data and trying to insert new list of data,id values are keep on increment because of auto-increment. is it possible to have new auto increment id with 1 ?
and i tried with ALTER TABLE table AUTO_INCREMENT = 1; its not working for me.
Use this query while deleting your old 20 Records.
truncate table YourTableName;
It will reset the database structure and if you insert new record it will start from 1(one) id again.
You cannot reset the counter to a value less than or equal to the
value that is currently in use. For both InnoDB and MyISAM, if the
value is less than or equal to the maximum value currently in the
AUTO_INCREMENT column, the value is reset to the current maximum
AUTO_INCREMENT column value plus one.
And also read this article Link
Just visit this question
I have a table with around 10k rows which I've imported. The ID is a significant column to my application, and it has to be ordered. Currently, I got something like: 1,2,3,4,5....5789,9275,9276.....
It jumped from 5789 to 9275. Is there any way I can reset the Auto Increment but also make it apply to the table? which means, now it will start giving them IDS all over again from 1 to 10k
Thanks!
ALTER TABLE <tablename> AUTO_INCREMENT=<new_value>;
Of course you need to fix the high IDs and all references to them manually.
However, why do you care? Does it really matter if there's a hole in the IDs? If yes, you might want to use a separate column that's always set to MAX(col) + 1 instead of an AUTO_INCREMENT column.
You can certainly reset the auto_increment value to be whatever you want by simply issuing this query:
ALTER TABLE <tbl> AUTO_INCREMENT = <n>;
where tbl is your table name and n is the value to start it at. However, if you have existing IDs in that table already, I believe it will simply set the next inserted items ID to be max(id) + 1 of the ID column
Lets say database has a table which has only two columns of ID which is Auto increment and name which is text. When we first add 2 names, then delete both of the names, next time again enter another name, the ID count starts from number 3 while it should start with number 1.
Question is that is there any way to reset the ID so that it starts from 0 once all values of ID's are removed instead of continuing increment from the last ID number that was removed?
Here's the SQL query to reset the AUTO_INCREMENT value:
ALTER TABLE tablename AUTO_INCREMENT = 0
You can use Truncate.
TRUNCATE TABLE yourtable;
It is similar to deleting all rows of your table but has some differences including resetting auto-increment to 0.
Yes you can
ALTER TABLE mytable AUTO_INCREMENT = 0
But why bother? There are plenty of numbers in the universe or even in 32 bits!
I think this will do what you are looking for.
ALTER TABLE table_name AUTO_INCREMENT = 1;
ALTER TABLE yourtable AUTO_INCREMENT = 1
There sure is!
ALTER TABLE 'mytable' AUTO_INCREMENT = 0;
This will reset the auto increment back down to 0 and continue from there.
A general note from MySQL-dev:
You cannot Reset the counter to a value less than or equal to any that have already been used. For MyISAM, if the value is less than or equal to the maximum value currently in the AUTO_INCREMENT column, the value is Reset to the current maximum plus one. For InnoDB, if the value is less than the current maximum value in the column, no error occurs and the current sequence value is not changed.
I have a table with an auto incrementing column. I need to set one of the rows to 1000 and never touch it again, but now that I've set it to 1000, auto increment keeps starting at 1001 and refuses to start at 1. Is there any way to get around this?
You cannot:
To change the value of the
AUTO_INCREMENT counter to be used for
new rows, do this:
ALTER TABLE t2 AUTO_INCREMENT = value;
You cannot reset the counter to a
value less than or equal to any that
have already been used. For MyISAM, if
the value is less than or equal to the
maximum value currently in the
AUTO_INCREMENT column, the value is
reset to the current maximum plus one.
For InnoDB, if the value is less than
the current maximum value in the
column, no error occurs and the
current sequence value is not changed.
http://dev.mysql.com/doc/refman/5.1/en/alter-table.html
Simple and short answer: you can't do this.
If you could, what would happen if you start your auto-increment at 1 and insert 1000 rows? The last couldn't be inserted due to "duplicate key"-error.
If you have to have a predefinded entry, with an id that never changes and is easy to remember, why don't you use 0 for that? Or, if you really need to use 1000, what's the problem with letting the other columns start at 1001?
Assuming you have no other row ID with 1000, you can insert the row to the bottom of the table, then you can simply use the update command:
UPDATE table.column SET id = 1000 WHERE id = current_id;
Assuming id is your auto-increment column. And current_id should be replaced with the id that the row is inserted at.
You can use MS Access that link to MySQL as external table, and you can change the auto increment table field value from MS Access via copy paste from Excel (first, you need to arrange the value of auto increment in Excel).
You could use the following statements:
UPDATE tbl SET id=1000 WHERE id=current_id;
ALTER TABLE tbl AUTO_INCREMENT=1001;