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You cannot create explicit indexes on table variables, only PRIMARY KEY and UNIQUE constraints, which create unique indexes underneath the covers . You cannot create non-unique indexes . If you need an index on a non-unique column, you must add attributes that make the combination unique and create a PRIMARY KEY or UNIQUE constraint on the combination . You cannot alter the definition of a table variable once it is declared . This means that everything you need in the table definition must be included in the original DECLARE statement . This fact is limiting on one hand, but it also results in fewer recompilations . Remember that one of the triggers of recompilations is DDL changes . You cannot issue SELECT INTO against a table variable, rather you have to use INSERT SELECT instead . Prior to SQL Server 2008 this limitation put table variables at a disadvantage compared to temporary tables because SELECT INTO could be done as a minimally logged operation, though INSERT SELECT couldn t . SQL Server 2008 introduces improvements in minimally logged operations, including the ability to process INSERT SELECT with minimal logging . I ll demonstrate this capability later in the chapter . You cannot qualify a column name with a nondelimited table variable name (as in @T1 .col1) . This is especially an issue when referring to a table variable s column in correlated subqueries with column name ambiguity . To circumvent this limitation, you have to delimit the table variable name (as in [@T1] .col1, or @T1 .col1) . In queries that modify table variables, parallel plans will not be used . Queries that only read from table variables can be parallelized .

Next is the de nition of our partitioned version of the LINEITEM table:

CREATE TABLE LINEITEMPART ( L_ORDERKEY L_PARTKEY L_SUPPKEY L_LINENUMBER L_QUANTITY L_EXTENDEDPRICE L_DISCOUNT L_TAX L_RETURNFLAG L_LINESTATUS L_SHIPDATE L_COMMITDATE L_RECEIPTDATE L_SHIPINSTRUCT L_SHIPMODE L_COMMENT ON PSYEAR (L_SHIPDATE);

Before you proceed, drop the index used in the previous step: DROP INDEX dbo.Orders.idx_unc_oid;

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The next series of operation create the route aggregates . To do this, we use the dbo.GeographyUnionAggregate() function from the SQL Server Spatial Tools project against the GEOGRAPHY column (GEOG) in the HIGHWAYS_TEMP table . To get unique route combinations to aggregate correctly (route type and route name combinations, such as Interstate 80) we use the GROUP BY operator in conjunction with a derived table . The results from the derived table are then inserted into the Highways table . For this first step, we are interested only in interstate and U .S . highways, hence the CTFIPS and STFIPS columns are not needed and are set to NULL . Additionally, since GEOM is declared as NOT NULL, we must supply a value for GEOM even though we are not describing the GEOMETRY workflow in this section . We will use an empty LineString as a placeholder:

INT INT INT INT MONEY MONEY MONEY MONEY CHAR(1) CHAR(1) SMALLDATETIME SMALLDATETIME SMALLDATETIME CHAR(25) CHAR(10) VARCHAR(44)

DECLARE @emptyLS GEOMETRY = geometry::Parse('LINESTRING EMPTY'); INSERT INTO Highways SELECT NULL, NULL, COL1, COL2, dbo.GeographyUnionAggregate(INTERMEDIATEAGG), @emptyLS FROM ( SELECT SIGNT1 AS COL1, SIGNN1 AS COL2, dbo.GeographyUnionAggregate(GEOG) AS INTERMEDIATEAGG FROM HIGHWAYS_TEMP WHERE (SIGNT1 = 'I' OR SIGNT1 = 'U') AND (GEOG IS NOT NULL) GROUP BY SIGNT1, SIGNN1 UNION ALL SELECT SIGNT2, SIGNN2, dbo.GeographyUnionAggregate(GEOG) FROM HIGHWAYS_TEMP WHERE (SIGNT2 = 'I' OR SIGNT2 = 'U') AND (GEOG IS NOT NULL) GROUP BY SIGNT2, SIGNN2 UNION ALL SELECT SIGNT3, SIGNN3, dbo.GeographyUnionAggregate(GEOG) FROM HIGHWAYS_TEMP WHERE (SIGNT3 = 'I' OR SIGNT3 = 'U') AND (GEOG IS NOT NULL) GROUP BY SIGNT3, SIGNN3 ) AS DERIVED_TABLE GROUP BY COL1, COL2 GO

NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)

You can get the next level of optimization by creating a clustered index on the orderid column. Because there's already a clustered index on the Orders table, drop it first and then create the desired one: DROP INDEX dbo.Orders.idx_cl_od; CREATE UNIQUE CLUSTERED INDEX idx_cl_oid ON dbo.Orders(orderid);

To aggregate the state routes, we need to execute another pass on the HIGHWAYS_TEMP table, using another derived table . This time, we are interested in aggregating state routes, so the STFIPS values become part of the equation . We have to add this additional qualifier since state-based routes are not guaranteed to be unique . (For example, the states of California and Wyoming could both have a State Route 101 .)

In TPC-H the values in columns L_SHIPDATE, L_COMMITDATE, and L_RECEIPTDATE are spread over seven years, but in the following script, which generates data and populates LINEITEMPART, I have modi ed the year values so that all dates are within the year 2009.

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