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What is the performance of INNER JOIN vs WHERE?

Oracle "JOIN ON" vs "NATURAL JOIN"?

  • I'm using apex oracle "SQL commands" to join three tables; In the first query I'm trying to use a "JOIN ON" to join the tables, but it won't work; ...show more

  • Answer:

    Try this: select SECTION_YEAR, SEMESTER, courses.COURSE_CODE, COURSE_NAME, INSTRUCTOR_LAST_NAME, INSTRUCTOR_FIRST_NAME from sections join courses on sections.COURSE_CODE = courses.COURSE_CODE join instructor on sections.INSTRUCTOR_ID = instructor.INSTRUCTOR_ID;

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