Solution:Step 1: Understand which columns can be updated in a viewTypically, primary key or key columns should not be updated. Foreign keys or non-key columns can be updated if allowed.Step 2: Analyze each optionUPDATE v_dept SET department_id = 3 WHERE employee_id = 7; updates department_id, likely

[Solved] Consider the view:CREATE VIEW v_dept AS SELECT department_id, employee_id FROM employees;Which of the following update statements will succeed? | SQL

SQL - Views

Consider the view:

CREATE VIEW v_dept AS SELECT department_id, employee_id FROM employees;

Which of the following update statements will succeed?

AUPDATE v_dept SET department_id = department_id + 1;

BUPDATE v_dept SET employee_id = NULL WHERE department_id = 2;

CUPDATE v_dept SET department_id = 3 WHERE employee_id = 7;

DUPDATE v_dept SET employee_id = 10 WHERE department_id = 5;

Step-by-Step Solution

Solution:

Step 1: Understand which columns can be updated in a view
Typically, primary key or key columns should not be updated. Foreign keys or non-key columns can be updated if allowed.
Step 2: Analyze each option
UPDATE v_dept SET department_id = 3 WHERE employee_id = 7; updates department_id, likely a foreign key, allowed. UPDATE v_dept SET department_id = department_id + 1; updates all rows' department_id, which may violate constraints. UPDATE v_dept SET employee_id = NULL WHERE department_id = 2; sets employee_id to NULL, violating NOT NULL on PK. UPDATE v_dept SET employee_id = 10 WHERE department_id = 5; updates employee_id (PK), typically restricted.
Final Answer:
UPDATE v_dept SET department_id = 3 WHERE employee_id = 7; -> Option C
Quick Check:
Update non-key columns in view allowed [OK]

Quick Trick: Update non-key columns through view, avoid keys [OK]

Common Mistakes:

MISTAKES

Trying to update key columns through views
Setting NOT NULL columns to NULL
Updating all rows without WHERE causing errors

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Consider the view:

Step 1: Understand which columns can be updated in a view

Step 2: Analyze each option

Final Answer:

Quick Check:

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