auto-increment

i have a table with ID , this ID is auto increment and primary key ,the first time i inserted to that table , the ID starts from 0 , but after i removing all the values from that table and inserted again to it , the ID doesn't start from 0 , but starts from the last value that ID had , what is going wrong please ? can i reset the value to 0 ? You may either truncate the table using TRUNCATE `table` Truncate will delete all of the data in the table. Note that using TRUNCATE will also not fire any DELETE triggers like DELETE . Or you can reset the count using ALTER TABLE `table` AUTO_INCREMENT =

I have a table with the following columns: id - INT UNSIGNED AUTO_INCREMENT name - VARCHAR(20) group - VARCHAR(20) I know that I can add a row like this: INSERT INTO table_name (name, group) VALUES ('my name', 'my group') I wonder if there is a way to add a row without specifying the column names , like when there is no AUTO_INCREMENT column ? Ike Walker For some databases, you can just explicitly insert a NULL into the auto_increment column: INSERT INTO table_name VALUES (NULL, 'my name', 'my group') Even better, use DEFAULT instead of NULL. You want to store the default value, not a NULL

How can I avoid getting this MySQL error Incorrect column specifier for column topic_id ? MySQL Error... #1063 - Incorrect column specifier for column 'topic_id' SQL Schema... CREATE TABLE discussion_topics ( topic_id char(36) NOT NULL AUTO_INCREMENT, project_id char(36) NOT NULL, topic_subject VARCHAR(255) NOT NULL, topic_content TEXT default NULL, date_created DATETIME NOT NULL, date_last_post DATETIME NOT NULL, created_by_user_id char(36) NOT NULL, last_post_user_id char(36) NOT NULL, posts_count char(36) default NULL, PRIMARY KEY (topic_id) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO

Is there a way to autoincrement a field with respect to the previous one...e.g if the previous record has the value 09-0001, then the next record should be assigned 09-0002 and so one...ideas? I'm thinking of overriding the save method, but how exactly I'm not so sure Django won't let you have more than one AutoField in a model, and you already have one for your primary key. So you'll have to override save and will probably need to look back at the table to figure out what to increment. Something like this: class Product(models.Model): code = models.IntegerField() number = models.IntegerField(

I have recently started a new job and noticed that all the SQL tables use the GUID data type for the primary key. In my previous job we used integers (Auto-Increment) for the primary key and it was a lot more easier to work with in my opinion. For example, say you had two related tables; Product and ProductType - I could easily cross check the 'ProductTypeID' column of both tables for a particular row to quickly map the data in my head because its easy to store the number (2,4,45 etc) as opposed to (E75B92A3-3299-4407-A913-C5CA196B3CAB). The extra frustration comes from me wanting to

After running for a long time, I get more and more holes in the id field. Some tables' id are int32, and the id sequence is reaching its maximum value. Some of the Java sources are read-only, so I cannot simply change the id column type from int32 to long , which would break the API. I'd like to renumber them all. This may be not good practice, but good or bad is not concerned in this question. I want to renumber, especially, those very long IDs like "61789238", "548273826529524324". I don't know why they are so long, but shorter IDs are also easier to handle manually. But it's not easy to

My objective is to get a primary key field automatically inserted when inserting new row in the table. How to get a sequence going from session to session in PostgreSQL? doubleemploi@hanbei:/home/yves$ psql -d test Mot de passe : psql (8.4.13) Saisissez « help » pour l''aide. test=> create sequence test001 start 10; CREATE SEQUENCE test=> select currval('test001'); ERREUR: la valeur courante (currval) de la séquence « test00 » n''est pas encore définie dans cette session --- current value not yet defined this session (???) test=> select setval('test001', 10); setval -------- 10 (1 ligne) test=