Distributed Query Processing 편집하기 (부분)

==Example of Distributed Query==
Consider a distributed database with two nodes:
*Node 1 stores employee data.
*Node 2 stores department data.
Query: Find all employees in the "Sales" department.
===Execution Steps===
{| class="wikitable"
!Step!!Action!!Performed on
|-
|1||Parse the query: SELECT employees.name FROM employees JOIN departments ON employees.dept_id = departments.dept_id WHERE departments.name = 'Sales'.||Query Coordinator
|-
|2||Decompose into sub-queries:
*Query 1: Retrieve department IDs for "Sales" from Node 2.
*Query 2: Retrieve employee data for the matching department IDs from Node 1. || Query Coordinator
|-
|3||Execute sub-queries on respective nodes:
*Node 2 returns the department ID for "Sales."
*Node 1 fetches employee names for the department ID. || Node 1, Node 2
|-
|4||Combine results and present the final output.||Query Coordinator
|}
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기울임꼴	''기울인 글씨''	기울인 글씨
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