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Database Query Optimization: Advanced Techniques for Efficient Data Retrieval

Learn powerful strategies to enhance database query performance and maximize data retrieval efficiency through advanced SQL techniques. Discover how to optimize SELECT, WHERE, and SUBCONSULTA operations for streamlined data processing.

thaddeus-patton
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Database Query Optimization: Advanced Techniques for Efficient Data Retrieval

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Presentation Transcript

  1. DML + subconsulta

  2. SUBCONSULTA SELECT WHERE atributo IN* (SELECT ...) COMBINAÇÃO • DML • INSERT • UPDATE • DELETE

  3. “Filtro” de DML • DML • UPDATE tabela SET campo=valor • WHERE campo=valor • DELETE FROM tabela • WHERE campo=valor

  4. “Filtro” de DML • DML • UPDATE tabela SET campo=valor • WHERE campo=valor • DELETE FROM tabela • WHERE campo=valor Usar para linkar com um conjunto ( subconsulta)

  5. “Filtro” de DML • DML • UPDATE tabela SET campo=valor • WHERE campo IN ( select ...) • DELETE FROM tabela • WHERE campo= (select MAX(cod) FROM tabela2)

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