Joining Tables with SQL

To link three different tables using the JOIN and WHERE clause in SQL:

1. Use the SELECT statement to define the columns you want to retrieve from the tables.
2. Use the FROM clause to specify the tables you want to join.
3. Use the JOIN keyword followed by the table name to specify the join condition.
4. Use the ON keyword followed by the column name(s) to specify the column(s) on which the tables should be joined.
5. Use the WHERE clause to specify additional conditions for the query.
6. Use the AND or OR operators to combine multiple conditions in the WHERE clause.
7. Specify the condition using the column names from the joined tables.
8. End the query with a semicolon (;) to execute it.

Example:

SELECT t1.column1, t2.column2, t3.column3
FROM table1 t1
JOIN table2 t2 ON t1.id = t2.table1_id
JOIN table3 t3 ON t2.id = t3.table2_id
WHERE t1.column4 = 'value1' AND t3.column5 > 10;

This query retrieves column1 from table1, column2 from table2, and column3 from table3. It joins table1, table2, and table3 using the specified conditions (t1.id = t2.table1_id and t2.id = t3.table2_id). It also adds additional conditions (t1.column4 = 'value1' and t3.column5 > 10) in the WHERE clause.