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Consider a scenario, there are three tables name ‘X’, ‘Y ‘and’ Z’ with schemes X (u, v, w), Y (l, u, m, n, o, p) and Z (r, s, t, u, q), These (Search on Google: Raise For Success) tables have a common attribute or field. We want to retrieve (Follow us on Twitter) the data from these tables.
I prefer to use INNER join for this type of
scenario its logical (Search on Google: Raise For Success) arguments are as follows:
- The INNER JOIN Selects all rows from all
participating tables as long (Subscribe our YouTube Channel V-Expert Services) as there is a match between the columns.
- INNER JOIN is for clarity. Using Where as
in your second example (Follow us on Twitter) can get lost in more complex queries, making it difficult
to determine how your tables are joined and make it more difficult to
troubleshoot problems.
- INNER JOIN is faster to pull more rows.
- JOIN works by concentrating the operation on the result of the first (Search on Google: Raise For Success) all tables, any subsequent joins would concentrate joining on the in memory result of the first joined tables and so on less read write needle movement, thus faster.
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