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Updating an identity column sql server

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Microsoft SQL Server is a computer application used to create desktop, enterprise, and web-based database applications.

It is used at different levels and with various goals.

Column 3 is somehow materialized out of thin air, as it does not physically exists in the record on this page.

The ‘magic’ is that the table metadata has changed and it now contains a column with a ‘default’ value: table (the third row in the image above) has a default with value 42.

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Slot 1 Column 1 Offset 0x4 Length 4 Length (physical) 4 id = 2 Slot 1 Column 2 Offset 0x8 Length 4 Length (physical) 4 some Value = 387 Notice how the physical record has increased in size (19 bytes vs.

For example, a computed column can have the definition: cost AS price * qty.

The expression can be a noncomputed column name, constant, function, variable, and any combination of these connected by one or more operators.

This is how SQL Server 2012 knows how to show a value for Column 3 for this record, even though is physically missing on the page.

With this ‘magic’ in place the ALTER TABLE will no longer have to update every row in the table and the operation is fast, metadata-only, no matter the number of rows in the table.