How to Resolve Max Recursion Errors in Employee Hierarchy Queries?

Maximum recursion error in employee level query

This query is designed to build an employee hierarchy by recursively querying a table representing employees and their managers. However, it encountered a "Maximum recursion depth of 100 exhausted" error. The problem stems from the recursive nature of the query, which can result in an infinite loop if the employee hierarchy is deeply nested.

To resolve this error, we can specify the maxrecursion option at the end of the query. This option allows us to control the maximum number of times a CTE can recurse before generating an error.

<code class="language-sql">...
from EmployeeTree
option (maxrecursion 0)</code>

By setting maxrecursion to 0, we allow infinite recursion. This means that queries can traverse the entire hierarchy as needed without encountering errors.

This solution effectively eliminates recursion errors by allowing queries to explore the entire hierarchy indefinitely. It should be noted that infinite recursion can cause performance problems, especially when the hierarchy is very large. In this case, other strategies may need to be implemented, such as breaking the hierarchy into smaller chunks or using a different approach to structuring it.

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