auto-increment

I have a 2 columns in my table: a varchar(8) and an int . I want to auto-increment the int column and when I do, I want to copy the value into the varchar(8) column , but pad it with 0's until it is 8 characters long, so for example, if the int column was incremented to 3 , the varchar(8) column would contain '00000003' . My two questions are, what happens when the varchar(8) column gets to '99999999' because I don't want to have duplicates? How would I do this in MySQL? If my values can be between 00000000 to 99999999 , how many values can i have before I run out? This is my alternative

I am adding batches of records to a table using a single insert statement. I want each new batch to be allocated incrementing numbers, but starting from 1 each time. So, if I have Batch Name IncementingValue 1 Joe 1 1 Pete 2 1 Andy 3 2 Sue 1 2 Mike 2 2 Steve 3 and I then add two records (using a single insert statement) : 3 Dave 3 Paul How can I run an update statement against this table so that Dave will be set to 1 and Paul to 2. I don't want to use a cursor. The ranking function ROW_NUMBER should do what you need. You didn't mention any specific rules about how the sequence number should be

I'm running SQL Server 2014 locally for a database that will be deployed to an Azure SQL V12 database. I have a table that stores values of extensible properties for a business-entity object, in this case the three tables look like this: CREATE TABLE Widgets ( WidgetId bigint IDENTITY(1,1), ... ) CREATE TABLE WidgetProperties ( PropertyId int IDENTITY(1,1), Name nvarchar(50) Type int -- 0 = int, 1 = string, 2 = date, etc ) CREATE TABLE WidgetPropertyValues ( WidgetId bigint, PropertyId int, Revision int, DateTime datetimeoffset(7), Value varbinary(255) CONSTRAINT [PK_WidgetPropertyValues]

I would like to create a table of user_widgets which is primary keyed by a user_id and user_widget_id, where user_widget_id works like a serial, except for that it starts at 1 per each user. Is there a common or practical solution for this? I am using PostgreSQL, but an agnostic solution would be appreciated as well. Example table: user_widgets | user_id | user_widget_id | user_widget_name | +-----------+------------------+----------------------+ | 1 | 1 | Andy's first widget | +-----------+------------------+----------------------+ | 1 | 2 | Andy's second widget | +-----------+---------------

Does XQuery Update support auto increment attributes, just like auto increment fields in SQL ? I'm using BaseX as my database. Arjan Given an answer from Christian Grün on the BaseX mailing list , this is doable when the node one is adding is defined in the XQuery Update statement, and hence can be enhanced using an {enclosed expression} before inserting it: You might specify the attribute counter within your XML file/database and increment it every time when you insert an element. A simple example: input.xml: <root count="0"/> insert.xq: let $root := doc('input.xml')/root let $count := $root/

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. 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_auto_increment); mysql> prepare stmt from @query; mysql> execute stmt; mysql> deallocate prepare stmt; Thx