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勉強会資料_SQLパフォーマンス詳解
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sayakek
June 16, 2026
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勉強会資料_SQLパフォーマンス詳解
2024年の勉強会用に作成した「SQLパフォーマンス詳解」についてのスライドです。
sayakek
June 16, 2026
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• 画像: 本書籍p3から引用
画像: 本書籍p4から引用
Select first_name, last_name from employees where employee_id = 2 ;
・ employee_id
subsidiary_id employee_id subsidiary_id CREATE UNIQUE INDEX employees_pk ON employees (employee_id,
subsidiary_id); Select first_name, last_name from employees where subsidiary_id = 20 ;
• employee_id subsidialy_id employee_id subsidialy_id = 20 subsidialy_id = 20
subsidialy_id
subsidialy_id CREATE UNIQUE INDEX employees_pk ON employees (subsidiary_id, employee_id); subsidiary_id
where subsidiary_id