SELECT *FROM student JOIN takes USING (ID);The above query is equivalent toSELECT *FROM student INNER JOIN takes USING (ID);SELECT *FROM student LEFT OUTER JOIN takes USING (ID);NONE OF the mentionedSELECT *FROM student OUTER JOIN takes USING (ID);
Question
SELECT *FROM student JOIN takes USING (ID);The above query is equivalent toSELECT *FROM student INNER JOIN takes USING (ID);SELECT *FROM student LEFT OUTER JOIN takes USING (ID);NONE OF the mentionedSELECT *FROM student OUTER JOIN takes USING (ID);
Solution
The above query "SELECT * FROM student JOIN takes USING (ID);" is equivalent to "SELECT * FROM student INNER JOIN takes USING (ID);".
The JOIN operation in SQL is by default an INNER JOIN if not specified otherwise. This means it will return all the records where there is a match in both the student and takes tables based on the ID.
The other options are not equivalent.
The "LEFT OUTER JOIN" would return all the records from the student table and the matched records from the takes table. If there is no match, the result is NULL on the takes side.
"OUTER JOIN" would return all records when there is a match in either left (student) or right (takes) table records.
So, the correct answer is "SELECT * FROM student INNER JOIN takes USING (ID);".
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