Selecting Into Tables, Sans Identity

Kevin Feasel

2017-08-29

T-SQL

Kenneth Fisher shows a couple of ways to remove an identity property from a column when creating a new table:

A while back I did a post about creating an empty table using a SELECT statement. Basically doing something like this:

1
SELECT TOP 0 * INTO tableNameArchive FROM tableName

will create a new table with the exact same structure as the source table. It can be a really handy way to create an archive table, a temp table, etc. You don’t create any of the extra objects (indexes, triggers, constraints etc) but what you do end up with is every table property from the original table. This includes datatypes, nullability, and (as I’m sure you realized from the title) IDENTITY. Which if you are creating an archive table, a temp table, etc is probably not something you want. Fortunately, there are two easy ways to get rid of the identity.

Click through to see those two methods.

Related Posts

Bugs and Pitfalls with Non-Determinism

Itzik Ben-Gan has started a new series on T-SQL bugs, pitfalls, and best practices. The first post in this series is on non-deterministic behavior: A nondeterministic function is a function that given the same inputs, can return different results in different executions of the function. Classic examples are SYSDATETIME, NEWID, and RAND (when invoked without […]

Read More

Changing Constraints in Near-Zero Downtime Situations

I have part six of my interminable series on near-zero downtime deployments: The locking story is not the same as with the primary and unique key constraints. First, there’s one extra piece: the transition will block access to dbo.LookupTable as well as the table we create the constraint on. That’s to keep us from deleting rows in […]

Read More

Categories

August 2017
MTWTFSS
« Jul Sep »
 123456
78910111213
14151617181920
21222324252627
28293031