Updating identity column
You will use the WHERE clause of the UPDATE statement to restrict the update to a single row. The basic syntax is: INSERT, table name, column list, VALUES, and then a list of the values to be inserted.The two hyphens in front of a line indicate that the line is a comment and the text will be ignored by the compiler.
I have a database table that has a lot of data already in the table and I need to add a new column to this table to include a new sequential number.One of my clients recently had an issue where a particularly high profile user (CEO) had their title spelled incorrectly in Active Directory; unfortunately the error wasn’t noticed right away and now, despite changing the information in Active Directory, Share Point was still showing the wrong title in the People Picker when granting the user rights to a Site Collection.Fortunately I had a partial Power Shell script to fix the issue and just needed to only slightly modify it – you can see the original script on pages 299 and 300 of my book.You must specify both the seed and increment or neither. Identity columns can be used for generating key values. The identity property on a column guarantees the following: USE Adventure Works2012; IF OBJECT_ID ('dbo.new_employees', ' U') IS NOT NULL DROP TABLE new_employees; GO CREATE TABLE new_employees ( id_num int IDENTITY(1,1), fname varchar (20), minit char(1), lname varchar(30) ); INSERT new_employees (fname, minit, lname) VALUES (' Karin', ' F', ' Josephs'); INSERT new_employees (fname, minit, lname) VALUES (' Pirkko', ' O', ' Koskitalo'); -- Here is the generic syntax for finding identity value gaps in data. SET IDENTITY_INSERT tablename ON; DECLARE @minidentval column_type; DECLARE @maxidentval column_type; DECLARE @nextidentval column_type; SELECT @minidentval = MIN($IDENTITY), @maxidentval = MAX($IDENTITY) FROM tablename IF @minidentval = IDENT_SEED('tablename') SELECT @nextidentval = MIN($IDENTITY) IDENT_INCR('tablename') FROM tablename t1 WHERE $IDENTITY BETWEEN IDENT_SEED('tablename') AND @maxidentval AND NOT EXISTS (SELECT * FROM tablename t2 WHERE t2.$IDENTITY = t1.$IDENTITY IDENT_INCR('tablename')) ELSE SELECT @nextidentval = IDENT_SEED('tablename'); SET IDENTITY_INSERT tablename OFF; -- Here is an example to find gaps in the actual data. For example, if a nonclustered index has four partitions, there are four B-tree structures, with one in each partition.
Depending on the data types in the nonclustered index, each nonclustered index structure will have one or more allocation units in which to store and manage the data for a specific partition.
This “User Information List” is located at By looking at this list you can see that several key pieces of information are stored here – unfortunately, when you change this information in Active Directory the information stored here is not updated (even after running a full or incremental import via UPS).
To complicate matters there is no way to edit the information via the browser, thus the need for a Power Shell script.
If you click the user’s name you’ll see the additional properties, including an “Edit Item” option, however, the edit dialog is simply a read-only display of the username, helpful right?
: So let’s first consider the scenario that my book addresses and assume that a user had had their name and/or email address changed.
At a minimum, each nonclustered index will have one IN_ROW_DATA allocation unit per partition that stores the index B-tree pages.