auto-increment

问题 Can I create a new table with an old table's autoincriment status in mysql client? I think, that ALTER TABLE new_table_name AUTO_INCREMENT=@my_autoincr_iment helps me, but this construction must use with a constant value. I don't want to use a difficult script. 回答1: mysql> create table new_table like old_table; mysql> select @my_auto_increment:=auto_increment from information_schema.tables where table_name='old_table'; mysql> set @query = CONCAT("alter table new_table auto_increment = ", @my

问题 I've been importing thousands of records multiple times in an effort to get the import running perfectly. As a result, now when I do the live import before release, the ID columns for the auto increment column are on around 300,000. Is there any easy way to 'reset' this once I have deleted all the data from these tables? I only want to for SEO reasons, the URL: Forum/1/Post Forum/35/Post Forum/5600/Post Looks a lot nicer and more concise (therefore more clickable in results) than Forum/300124

问题 I have a problem on postgresql which I think there is a bug in the postgresql, I wrongly implement something. There is a table including colmn1(primary key) , colmn2(unique) , colmn3 , ... After an insertion of a row, if I try another insertion with an existing colmn2 value I am getting a duplicate value error as I expected. But after this unsuccesful try, colmn1 's next value is incremented by 1 although there is no insertion so i am getting rows with id sequences like , 1,2,4,6,9.(3,5,6,7,8

问题 I have a table with an auto-increment ID field as shown below. +------------+-------------------------------------+ | company_id | name | +------------+-------------------------------------+ | 1 | International Client | | 2 | Oracle | | 3 | test | | 4 | testabc | | 5 | testdef | | 6 | abcd | +------------+-------------------------------------+ I want to update the ID column to be a GUID using the uuid() function. Additionally, how do I update the foreign key references to the correct GUID?

问题 I saw someone not set the length in a tutorial but it was specifically for counting the total number of users and just set to auto-increment. I've been of the habit of always specifying a length because I thought it was mandatory, but I wanted to ask if I can leave it blank unless it specifically a date or pin number etc where the length is always set. (I used to set it as 11 digits or more if I wasn't sure) 回答1: Every integer field defaults to 11 when left blank so you can leave it. 回答2: No,

问题 I saw someone not set the length in a tutorial but it was specifically for counting the total number of users and just set to auto-increment. I've been of the habit of always specifying a length because I thought it was mandatory, but I wanted to ask if I can leave it blank unless it specifically a date or pin number etc where the length is always set. (I used to set it as 11 digits or more if I wasn't sure) 回答1: Every integer field defaults to 11 when left blank so you can leave it. 回答2: No,

问题 MySQL CREATE TABLE `role` ( `id_role` INT(11) unsigned NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id_role`) ) AUTO_INCREMENT=1; Hibernate @Entity public class Role { private Integer idRole; @Column(name = "id_role", precision = 10) @GeneratedValue @Id public Integer getIdRole() { return idRole; } public void setIdRole(Integer idRole) { this.idRole = idRole; } } Given the above background, who is responsible of the auto-incrementation of the id_role column when creating a new role ? In other words

问题 I have a table to make temporary id`s . When i delete all of the rows of my table , auto increment value for this table will reset to 0 . but i don't want to reset the auto increment. What can i do? 回答1: Compare TRUNCATE TABLE: Any AUTO_INCREMENT value is reset to its start value. This is true even for MyISAM and InnoDB, which normally do not reuse sequence values. ... with DELETE FROM: If you delete the row containing the maximum value for an AUTO_INCREMENT column, the value is not reused

问题 I have a table to make temporary id`s . When i delete all of the rows of my table , auto increment value for this table will reset to 0 . but i don't want to reset the auto increment. What can i do? 回答1: Compare TRUNCATE TABLE: Any AUTO_INCREMENT value is reset to its start value. This is true even for MyISAM and InnoDB, which normally do not reuse sequence values. ... with DELETE FROM: If you delete the row containing the maximum value for an AUTO_INCREMENT column, the value is not reused

问题 Basically I have a table that versions products, so it has two columns of interest, id | product_id id is an autoincrement column, product_id is just an int When a product is first created the product_id comes from the id , When the product is edited we duplicate the row, so the product_id is the same, but the id is different. so when we first create the product we do two queries, insert, then update table whatever set product_id = id where id = {the insert id} This works, but I am wondering