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SQL: Display all employee data for the department 57

SQL Basic Select Statement: Exercise-33 with Solution.

From the following table, write a SQL query to retrieve the details of the employees who work in the department 57. Return emp_idno, emp_fname, emp_lname and emp_dept.

Sample table: emp_details

 

Sample Solution:

SELECT * 
 FROM emp_details 
  WHERE emp_dept= 57;

Output of the Query:

emp_idno	emp_fname	emp_lname	emp_dept
839139		Maria		Foster		57
127323		Michale		Robbin		57
843795		Enric		Dosio		57
847674		Kuleswar	Sitaraman	57
555935		Alex		Manuel		57

Relational Algebra Expression:

Relational Algebra Expression: Display all the data of employees that work in the department 57.

Relational Algebra Tree:

Relational Algebra Tree: Display all the data of employees that work in the department 57.

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Query Visualization:

Duration:

Query visualization of Display all the data of employees that work in the department 57 - Duration

Rows:

Query visualization of Display all the data of employees that work in the department 57 - Rows

Cost:

Query visualization of Display all the data of employees that work in the department 57 - Cost

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Previous: From the following table, write a SQL query to find the details of employees whose last name is 'Snares'. Return emp_idno, emp_fname, emp_lname, and emp_dept.
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SQL: Tips of the Day

Can a foreign key be NULL and/or duplicate?

First remember a Foreign key simply requires that the value in that field must exist first in a different table (the parent table). That is all an Foreign key is by definition. Null by definition is not a value. Null means that we do not yet know what the value is.

Ref: https://bit.ly/3uVu3OS