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 supply suggestions to universal difficulties encountered utilizing all models of SQL Server, with a spotlight at the newest model, SQL Server 2000.Expert assistance and actual code examples educate complicated database programmers to write down extra effective and better-performing code that takes complete good thing about T-SQL. The authors supply functional ideas to the standard difficulties programmers face and comprise in-depth details on complex T-SQL themes comparable to joins, subqueries, saved techniques, triggers, user-defined services (UDFs), listed perspectives, cascading activities, federated perspectives, hierarchical constructions, cursors, and extra.
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Breaking this down into two parts, you first have to determine when the last order was placed, and then you have to compare the order date of each order to this date. The first of these queries is shown in Listing 2−1. Listing 2−1: Finding the Date of the Last Order SELECT MAX (OrderDate) FROM Orders You now have the date of the last order, so you can compare the order dates in the table to this value. For this to work, you need to put the first query in parentheses. The final query is presented in Listing 2−2.
00 deptno 400 200 100 400 400 NULL deptname Management Production Engineering Management Management NULL Step 2. Perform ED RIGHT OUTER JOIN Jobs. 30 You should now get the desired output. With left and right outer joins, the order in which the tables appear in the query determines the order of their processing. This, of course, makes sense, because their order affects the output. In the case of full outer joins, however, their order doesn't affect the output; hence, it doesn't determine their processing order.
Table 1−18: Correct Output for an SQL−92 Query Looking for Mismatches deptno deptname empid empname deptno jobid salary 300 Sanitation NULL NULL NULL NULL NULL The output looks like the desired output. Take a look the execution plan shown in Figure 1−3. Figure 1−3: Execution plan for an outer join in the SQL−92 syntax SHOWPLAN's textual output is shown in Listing 1−28. [Departments]. [PK_emps_empid] AS [E])) Let's examine this plan step by step. Step 1. Let Input1 = all rows from Employees. The output of Step 1 is shown in Table 1−19.
Advanced Transact−SQL for SQL Server 2000 by Kalen Delaney