Asked by: Ruddy Buurs
asked in category: General Last Updated: 15th February, 2020

Why LEFT JOIN increases number of rows?

Left joins can increase the number of rows in the left table if there are multiple matches in the right table.

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Hereof, will LEFT JOIN increases number of rows?

Left joins can increase the number of rows in the left table if there are multiple matches in the right table.

Also Know, how inner join result in more rows? Inner Join can for sure return more records than the records of the table. Inner join returns the results based on the condition specified in the JOIN condition. If there are more rows that satisfy the condition (as seen in query 2), it will return you more results.

Simply so, why does LEFT JOIN add rows?

A common misconception about SQL joins is that they give you as many rows as the join specifies - for example, a left join will give you the amount of rows in the left table, or an inner join will give you the amount of rows common to both tables.

When would result set from a left outer join have more rows than an inner join?

The LEFT OUTER JOIN will return all records from the LEFT table joined with the RIGHT table where possible. If there are matches though, it will still return all rows that match, therefore, one row in LEFT that matches two rows in RIGHT will return as two ROWS, just like an INNER JOIN.

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