In MySQL, which lacks CTE (Common Table Expression) support, converting recursive CTE queries like the one used in MSSQL to build hierarchical category trees can pose a challenge.
The provided MSSQL CTE query repeatedly extracts the parent category for a given category ID, effectively traversing the tree from the bottom up. Unfortunately, MySQL lacks the recursive capabilities of CTEs.
As a workaround, a stored procedure can be implemented to simulate the recursive nature of the CTE. One such stored procedure is described in a previous answer:
Generating Depth based tree from Hierarchical Data in MySQL (no CTEs)
This stored procedure provides a recursive mechanism to build a hierarchical tree structure from hierarchical data, comparable to the functionality of a CTE. By leveraging it, you can achieve similar results to the MSSQL CTE query without directly using CTE syntax.
The above is the detailed content of How to Convert a Recursive MSSQL CTE Query to MySQL?. For more information, please follow other related articles on the PHP Chinese website!