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Which of the following are valid types of JOINs? 1 pointLEFT OUTER JOINRIGHT OUTER JOINFULL OUTER JOINFULL LEFT JOINAll of the above

Question

Which of the following are valid types of JOINs?

  1. LEFT OUTER JOIN
  2. RIGHT OUTER JOIN
  3. FULL OUTER JOIN
  4. FULL LEFT JOIN
  5. All of the above
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Solution

To determine which of the given options are valid types of JOINs, we can analyze each option one by one:

  1. LEFT OUTER JOIN: This type of JOIN returns all the records from the left table and the matching records from the right table. If there is no match, NULL values are returned for the right table.

  2. RIGHT OUTER JOIN: This type of JOIN returns all the records from the right table and the matching records from the left table. If there is no match, NULL values are returned for the left table.

  3. FULL OUTER JOIN: This type of JOIN returns all the records when there is a match in either the left or right table. If there is no match, NULL values are returned for the non-matching table.

  4. FULL LEFT JOIN: This is not a valid type of JOIN. It seems to be a combination of a FULL OUTER JOIN and a LEFT OUTER JOIN, but it is not a recognized syntax in most database systems.

Based on the explanations above, the valid types of JOINs are:

  • LEFT OUTER JOIN
  • RIGHT OUTER JOIN
  • FULL OUTER JOIN

Therefore, the correct answer is "All of the above".

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