What is full outer join explain with example?
The FULL OUTER JOIN keyword returns all records when there is a match in left (table1) or right (table2) table records. Tip: FULL OUTER JOIN and FULL JOIN are the same.
What is full join in SQL with example?
SQL full outer join is used to combine the result of both left and right outer join and returns all rows (don’t care its matched or unmatched) from the both participating tables.
What is the use of full join in SQL?
The SQL FULL JOIN command
LEFT JOIN and RIGHT JOIN each return unmatched rows from one of the tables— FULL JOIN returns unmatched rows from both tables. It is commonly used in conjunction with aggregations to understand the amount of overlap between two tables.
Why full outer join is used?
The full outer join statement is useful when you want all rows combined from your tables. The resulting table may have missing data, which could indicate an area of concern that needs to be addressed. The full outer join returns all rows, which can be a large data set depending on the number of rows in the tables.
Why full outer join is not working?
MySQL doesn’t have syntax keyword FULL OUTER JOIN. You have to use combination of LEFT and RIGHT JOIN to obtain full joins. You’re getting that error because MySQL does not support (or recognize) the FULL OUTER JOIN syntax. However, it is possible emulate a FULL OUTER JOIN in MySQL.
What is equi join?
An equi-join is a basic join with a WHERE clause that contains a condition specifying that the value in one column in the first table must be equal to the value of a corresponding column in the second table.
Can we use full join?
Using Full Joins
A FULL JOIN returns all the rows from the joined tables, whether they are matched or not i.e. you can say a full join combines the functions of a LEFT JOIN and a RIGHT JOIN .
What does a full join do?
A FULL JOIN returns all records from both tables. This includes records that do not match. Non-matching rows return columns with NULL values.
What is the difference between where and having clauses?
A HAVING clause is like a WHERE clause, but applies only to groups as a whole (that is, to the rows in the result set representing groups), whereas the WHERE clause applies to individual rows. A query can contain both a WHERE clause and a HAVING clause. … The HAVING clause is then applied to the rows in the result set.
What three join types are included in the outer join classification?
Outer join is again classified into 3 types: Left Outer Join, Right Outer Join, and Full Outer Join. These are explained as following below. Left Outer Join: Left Outer Join returns all the rows from the table on the left and columns of the table on the right is null padded.