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Table 4-16. Subordinates of Employee 5
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EmployeeID ReportsTo FirstName LastName 5 6 7 9 2 5 5 5 Steven Michael Robert Anne Buchanan Suyama King Dodsworth
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A recursive CTE contains at minimum two queries (also known as members). The first query that appears in the preceding CTE's body is known as the Anchor Member. The anchor member is merely a query that returns a valid table and is used as the basis or anchor for the recursion. In our case, the anchor member simply returns the row for the input root employee (employee 5). The second query that appears in the preceding CTE's body is known as the Recursive Member. What makes the query a recursive member is a recursive reference to the CTE's nameEmpsCTE. Note that this reference is not the same as the reference to the CTE's name in the outer query. The reference in the outer query gets the final result table returned by the CTE, and it involves no recursion. However, the inner reference is made before the CTE's result table is finalized, and it is the key element that triggers the recursion. This inner reference to the CTE's name stands for "the previous result set," loosely speaking. In the first invocation of the recursive member, the reference to the CTE's name represents the result set returned from the anchor member. In our case, the recursive member returns subordinates of the employees returned in the previous result setin other words, the next level of employees. There's no explicit termination check for the recursion; rather, recursion stops as soon as the recursive member returns an empty set. Because the first invocation of the recursive member yielded a nonempty set (employees 6, 7, and 9), it is invoked again. The second time the recursive member is invoked, the reference to the CTE's name represents the result set returned by the previous invocation of the recursive member (employees 6, 7, and 9). Because these employees have no subordinates, the second invocation of the recursive member yields an empty set, and recursion stops. The reference to the CTE's name in the outer query stands for the unified (concatenated) results sets of the invocation of the anchor member and all the invocations of the recursive member. If you run the same code providing employee 2 as input instead of employee 5, you will get the result shown in Table 4-17.
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Table 4-17. Subordinates of Employee 2
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EmployeeID ReportsTo FirstName LastName 2 1 3 4 5 NULL 2 2 2 2 Andrew Nancy Janet Margaret Steven Fuller Davolio Leverling Peacock Buchanan
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EmployeeID ReportsTo FirstName LastName 8 6 7 9 2 5 5 5 Laura Michael Robert Anne Callahan Suyama King Dodsworth
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Here, the anchor member returns the row for employee 2. The first invocation of the recursive member returns direct subordinates of employee 2: employees 1, 3, 4, 5, and 8. The second invocation of the recursive member returns direct subordinates of employees 1, 3, 4, 5, and 8: employees 6, 7, and 9. The third invocation of the recursive member returns an empty set, and recursion stops. The outer query returns the unified result sets with the rows for employees: 2, 1, 3, 4, 5, 8, 6, 7, and 9. If you suspect that your data might contain cycles, you can specify the MAXRECURSION hint as a safety measure to limit the number of invocations of the recursive member. You specify the hint right after the outer query: WITH cte_name AS (cte_body) outer_query OPTION(MAXRECURSION n);
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In this line of code, n is the limit for the number of recursive iterations. As soon as the limit is exceeded, the query breaks and an error is generated. Note that MAXRECURSION is set to 100 by default. If you want to remove this limit, specify MAXRECURSION 0. This setting can be specified at the query level only; there's no session, database, or server-level option that you can set to change the default. To understand how SQL Server processes the recursive CTE, examine the execution plan in Figure 44, which was produced for the earlier query returning subordinates of employee 5.
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