What is the difference between left join with where clause & LEFT JOIN without where clause?
Also question is, what is the difference between left join with where clause and left join without where clause?
When you use a Left Outer join without an On or Where clause, there is no difference between the On and Where clause. Both produce the same result as in the following. First we see the result of the left join using neither an On nor a Where clause.
Secondly, can we use where clause with left join? The LEFT JOIN allows you to query data from two or more tables. Similar to the INNER JOIN clause, the LEFT JOIN is an optional clause of the SELECT statement, which appears immediately after the FROM clause. When you use the LEFT JOIN clause, the concepts of the left table and the right table are introduced.
One may also ask, what is the difference between join and where clause?
Rows of the outer table that do not meet the condition specified in the On clause in the join are extended with null values for subordinate columns (columns of the subordinate table), whereas the Where clause filters the rows that actually were returned to the final output.
What happens when you join two tables together without an on clause?
Any JOIN without an ON clause is a CROSS JOIN. The LEFT JOIN is an outer join, which produces a result set with all rows from the table on the "left" (t1); the values for the columns in the other table (t2) depend on whether or not a match was found. JOINs can be concatenated to read results from three or more tables.