By Kalen Delaney
In complicated Transact-SQL for SQL Server 2000, authors Itzik Ben-Gan and Thomas Moreau discover the strong features of Transact-SQL (T-SQL). Ben-Gan and Moreau provide options to universal difficulties encountered utilizing all types of SQL Server, with a spotlight at the most up-to-date model, SQL Server 2000.Expert advice and genuine code examples educate complex database programmers to jot down extra effective and better-performing code that takes complete benefit of T-SQL. The authors provide useful recommendations to the typical difficulties programmers face and comprise in-depth details on complicated T-SQL themes equivalent to joins, subqueries, saved tactics, triggers, user-defined services (UDFs), listed perspectives, cascading activities, federated perspectives, hierarchical buildings, cursors, and extra.
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Extra info for Advanced Transact−SQL for SQL Server 2000
Listing 1−48 shows the SHOWPLAN output. [OrderID] >= 11000) ORDERED FORWARD) Notice the significant difference in the number of logical reads required to satisfy the first query as opposed to the second one. Also, the first query plan uses a nested−loops join algorithm, and the second one uses the more efficient merge join algorithm. 5's query processor supports only one join algorithm, or strategy the nested−loops join. As of SQL Server 7, three join strategies are available: nested loops, hash, and merge.
Deptno The output of this query is shown in Table 1−9. 00 deptno NULL 100 200 300 400 400 400 deptname NULL Engineering Production Sanitation Management Management Management The output in this case consists of all of the following: • All matching rows from both tables • All rows from the Employees table with no matching department (in this case, Jeffrey's row), with NULLs replacing the values that were supposed to come from the Departments table • All rows from the Departments table with no matching employee (in this case, the Sanitation department's row), with NULLs replacing the values that were supposed to come from the Employees table Can you guess how to write this query in the old−style syntax?
Check out the solution in Listing 2−3. Listing 2−3: Finding the Difference between Price and Average Price SELECT ProductID, UnitPrice ( SELECT AVG (UnitPrice) FROM Products ) AS Difference FROM Products Using the IN Predicate as a Subquery Another example of a nested subquery is the IN predicate. Predicates are expressions that return TRUE, FALSE, or UNKNOWN. You have probably seen the IN predicate when you compared a column to a number of fixed values. Using IN is more elegant than using a bunch of OR predicates.
Advanced Transact−SQL for SQL Server 2000 by Kalen Delaney