Databases Reference
In-Depth Information
So, let's see an example. Run the following query to create a new table on the
Adven-
tureWorks
database:
SELECT
*
INTO
dbo
.
Address
FROM
Person
.
Address
Listing 3-48.
Inspect the number of rows by running the following queries; they should show
19,614 rows:
SELECT
*
FROM
sys
.
partitions
WHERE
object_id
=
object_id
(
'dbo.Address'
)
Listing 3-49.
SELECT
*
FROM
sys
.
dm_db_partition_stats
WHERE
object_id
=
object_id
(
'dbo.Address'
)
Listing 3-50.
Now run the following query, and inspect the graphical execution plan:
SELECT
*
FROM
dbo
.
Address
WHERE
City
=
'London'
Listing 3-51.
Running this query will create a new statistics object for the
City
column, and will show
the plan in Figure 3-13. Note that the estimated number of rows is 434, and it's using a
simple Table Scan operator.
