[Solved] Which SQL join syntax is correct for joining two tables employees and departments on department_id? — Ans: SELECT * FROM employees JOIN departments ON employees.department_id =... | SQL

SQL - Advanced Joins

Which SQL join syntax is correct for joining two tables employees and departments on department_id?

ASELECT * FROM employees JOIN departments USING employees.department_id = departments.department_id;

BSELECT * FROM employees JOIN departments WHERE employees.department_id = departments.department_id;

CSELECT * FROM employees, departments ON employees.department_id = departments.department_id;

DSELECT * FROM employees JOIN departments ON employees.department_id = departments.department_id;

Step-by-Step Solution

Solution:

Step 1: Identify correct JOIN syntax
The correct syntax uses JOIN ... ON condition to specify join keys.
Step 2: Check each option
SELECT * FROM employees JOIN departments ON employees.department_id = departments.department_id; uses JOIN ... ON correctly. USING with a full equality condition is invalid as USING expects column names only. JOIN ... WHERE is invalid syntax for explicit joins. Comma-separated tables with ON is invalid.
Final Answer:
SELECT * FROM employees JOIN departments ON employees.department_id = departments.department_id; -> Option D
Quick Check:
JOIN ... ON is correct syntax [OK]

Quick Trick: Use JOIN ... ON for correct join syntax [OK]

Common Mistakes:

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Which SQL join syntax is correct for joining two tables employees and departments on department_id?