what is the difference between inner and outer join in sql?
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Inner and outer joins are combine rows from two or more tables into a single result using a join condition. The join condition specifies how columns from each table are matched to one another. ... Inner joins don't include non-matching rows; whereas, outer joins do include them.
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Joins versus Subqueries. Joins and subqueries are both used to combine data from different tables into a single result. ... Subqueries can be used to return either a scalar (single) value or a row set; whereas, joins are used to return rows. A common use for a subquery may be to calculate a summary value for use in a query ...
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Different Types of SQL JOINs (INNER) JOIN: Returns records that have matching values in both tables. LEFT (OUTER) JOIN: Returns all records from the left table, and the matched records from the right table.
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(INNER) JOIN: Returns records that have matching values in both tables. LEFT (OUTER) JOIN: Returns all records from the left table, and the matched records from the right table. RIGHT (OUTER) JOIN: Returns all records from the right table, and the matched records from the left table.
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What is the difference between Equi Join and Inner Join in SQL? An equijoin is a join with a join condition containing an equality operator. ... An inner join is a join of two or more tables that returns only those rows (compared using a comparison operator) that satisfy the join condition.
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An INNER JOIN is such type of join that returns all rows from both the participating tables where the key record of one table is equal to the key records of another table. This type of join required a comparison operator to match rows from the participating tables based on a common field or column of both the tables.
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The main difference between the Left Join and Right Join lies in the inclusion of non-matched rows. Left outer join includes the unmatched rows from the table which is on the left of the join clause whereas a Right outer join includes the unmatched rows from the table which is on the right of the join clause.
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JOIN and INNER JOIN are the same, the inner keyword is optional as all joins are considered to be inner joins unless otherwise specified. ... An INNER JOIN will only return matched rows if a row in table A matches many rows in table B the table A row will be repeated with each table B row and vice versa.
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Difference between Inner and Outer Join. ... A Left Outer Join will return all the rows from table 1 and only those rows from table 2 which are common to table 1 as well. A Right Outer Join will do just the opposite. It will give all the records from table 2 and only the corresponding matching records from table 1.
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In SQL, the left join returns all the records from first table and matched records from second table. ... Basically there is no difference in left join and left outer join. Left outer join also returns same results as left join. In some database, left join is known as left outer join.
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Inner Join combines the two or more records but displays only matching values in both tables. Inner join applies only the specified columns. Cross join defines as a Cartesian product where the number of rows in the first table multiplied by the number of rows in the second table. ... Cross Join applies to all columns.
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A LEFT [OUTER] JOIN can be faster than the subquery used for the same case because the server will be able to optimize it better. Therefore, subqueries can be slower than the LEFT [OUTER] JOIN, but its readability is higher as compare to Joins.
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Inner Join vs. ... In SQL, a join is used to compare and combine — literally join — and return specific rows of data from two or more tables in a database. An inner join finds and returns matching data from tables, while an outer join finds and returns matching data and some dissimilar data from tables.
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The where clause applies to the whole resultset; the on clause only applies to the join in question. ... However, if you had included a condition on a value in the table in the outer side of the join, it would have made a significant difference.
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A cross join produces a cartesian product between the two tables, returning all possible combinations of all rows. It has no on clause because you're just joining everything to everything. A full outer join is a combination of a left outer and right outer join.
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INNER JOIN is ANSI syntax whereas the WHERE syntax is more relational model oriented. The INNER JOIN is generally considered more readable and it is a cartesian product of the tables, especially when you join lots of tables but the result of two tables JOIN'ed can be filtered on matching columns using the WHERE clause.
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The key difference between a left outer join, and a right outer join is that in a left outer join it's the table in the FROM clause whose all rows are returned. Whereas, in a right outer join we are returning all rows from the table specified in the join clause. See you in the next lesson.