Displaying Data from Multiple Tables by SQL In Hindi & Urdu
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Displaying data from multiple tables is a common task in SQL when working with relational databases. Relational databases are structured in a way that data is divided into multiple tables, and to get meaningful information, we often need to combine data from multiple tables. In SQL, this is done by joining tables together using the JOIN keyword.
There are different types of joins in SQL, including:
INNER JOIN: returns only the rows that have matching values in both tables being joined.
LEFT JOIN: returns all the rows from the left table and matching rows from the right table, and NULL values for non-matching rows.
RIGHT JOIN: returns all the rows from the right table and matching rows from the left table, and NULL values for non-matching rows.
FULL OUTER JOIN: returns all the rows from both tables, and NULL values for non-matching rows.
To join tables, we need to specify the tables we want to join and the columns that we want to join on using the ON clause.
Displaying Data from Multiple Tables by SQL In Hindi & Urdu
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