Based on the ON clause, INNER JOIN retrieves all records that are common to both tables. LEFT JOIN retrieves all entries from the LEFT linked table as well as relevant records from the RIGHT table, but if you choose specific fields from the RIGHT table, these columns will contain NULL if there are no connected records.
Inner joins are further subdivided into three categories: 1) Natural join 2) Theta join 3) Join with EQUI.
When there are matching values in a field common to both tables, inner joins combine records from both tables. To pick all employees in each department, use INNER JOIN with the Departments and Employees tables.
An INNER JOIN in SQL is the same as a JOIN clause in that it joins rows from two or more tables. The consequence of an inner join of A and B is A intersect B, or the inner half of a Venn diagram intersection.
EQUI JOIN is similar to INNER JOIN in that it returns records if the relative tables' column(s) values are equal or match.
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