By Kalen Delaney
In complex Transact-SQL for SQL Server 2000, authors Itzik Ben-Gan and Thomas Moreau discover the robust features of Transact-SQL (T-SQL). Ben-Gan and Moreau provide ideas to universal difficulties encountered utilizing all types of SQL Server, with a spotlight at the newest model, SQL Server 2000.Expert counsel and genuine code examples educate complex database programmers to jot down extra effective and better-performing code that takes complete good thing about T-SQL. The authors supply sensible options to the standard difficulties programmers face and contain in-depth info on complicated T-SQL themes corresponding to joins, subqueries, saved methods, triggers, user-defined features (UDFs), listed perspectives, cascading activities, federated perspectives, hierarchical constructions, cursors, and extra.
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Extra info for Advanced Transact−SQL for SQL Server 2000
Since this company doesn't care too much about sanitation, they have no employees in that department. Jeffrey's disappearance is a bit more complicated. Jeffrey doesn't belong to any specific department, so he has NULL in the deptno column. You're probably asking yourself how that can be. Well, Leo, the company's owner, is Jeffrey's uncle. Before Jeffrey joined Leo's latex company, he used to work in the city hall's parks department and was Leo's pride and joy. However, he was just recently fired from his old job and joined Leo's company.
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 Step 2. Let Input2 = all rows from Departments WHERE deptno IS NULL. The output of Step 2 is shown in Table 1−16. Table 1−16: Output of Step 2 in an Old−Style Query Looking for Mismatches deptno deptname (Empty set) Step 3. Let Result = Input1 LEFT OUTER JOIN Input2. Since there are no rows in the second input, all the values that were supposed to come from it are replaced with NULLs, as the output in Table 1−17 shows. Table 1−17: Output of Step 3 in an Old−Style Query Looking for Mismatches deptno 100 200 300 400 deptname Engineering Production Sanitation Management empid NULL NULL NULL NULL empname NULL NULL NULL NULL deptno NULL NULL NULL NULL jobid NULL NULL NULL NULL salary NULL NULL NULL NULL Controlling the Order of Join Processing With the SQL−92 syntax, you can control the order of the query execution phases.