Alex Xu
@alexxubyte
Co-Founder of ByteByteGo | Author of the bestselling book series: ‘System Design Interview’ | YouTube:
加入 July 2010
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Visualizing a SQL query in 5 mins
SQL statements are executed by the database system in several steps, including:
- Parsing the SQL statement and checking its validity
- Transforming the SQL into an internal representation, such as relational algebra
- Optimizing the internal representation and creating an execution plan that utilizes index information
- Executing the plan and returning the results
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