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How to Use Computed Column in SQL Server Databases with Computed-Column Samples
A computed column can be defined as an expression which can use other columns in the same table as well as using other table values via user-defined functions. And when you alter the sql function with tables names in two part format including the schema name and "WITH SCHEMABINDING" hint, this time the function will not be able for use in an expression of a persisted column
ALTER TABLE attempt failed, this explaination came through perfectly, tatero Log In or Register to post comments Preeti (not verified) on May 13, 2004 This is a very systematic solution given to a problem ususlly faced while migrating from Oracle to SQL 2000. To demonstrate this T-SQL activity, run the code that Listing 1 shows to create and populate the Orders2 and OrderDetails2 tables in the Northwind database
sql server - Why does ALTER COLUMN to NOT NULL cause massive log file growth? - Database Administrators Stack Exchange
But it's clear that - while both the update operation and the addition of the NOT NULL constraint undeniably write to the page - the latter does so in an entirely different way. On databases with one of the snapshot isolation options enabled then the versioning information in each row is updated (@SQL Kiwi points out that this can also occur in databases without SI enabled as described here)
When I am perusing an unfamiliar database for data elements it is easier to miss a piece of information when the data elements in a table are not logically grouped together. Also, sometimes I have been forced to write a bit more complex code which enumerates the columns by their names, or by part of the names used as a convention
Add a column, with a default value, to an existing table in SQL Server - Stack Overflow
A much more thorough SQL script to add a column with a default value is below including checking if the column exists before adding it also checkin the constraint and dropping it if there is one
But do you know what will be the solution when ID column is referenced as foreign key in other multiple tables? because in this case it wouldnt let me delete that old ID column. can i chaneg the order of columns in a table as i dont want to disturb the column sequence of my primary key column after using the above suggested methods
alter table abc ADD dad varchar(50) after parentname But it throws me the following error message Msg 170, Level 15, State 1, Line 1 Line 1: Incorrect syntax near 'after'. If you look at a page of data (for example, by using DBCC PAGE in MSSQL) you will see that the storage order of the fields does not correspond to the order you specified in the CREATE TABLE statement
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