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SQL: Find the data of employees whose last name is 'Snares'

SQL Basic Select Statement: Exercise-32 with Solution

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.

Sample table: emp_details

 

Sample Solution :

SELECT * 
 FROM emp_details 
  WHERE emp_lname= 'Snares';

Output of the Query:

emp_idno	emp_fname	emp_lname	emp_dept
526689		Carlos		Snares		63
328717		Jhon		Snares		63

Relational Algebra Expression:

Relational Algebra Expression: Find the data of employees whose last name is 'Snares'.

Relational Algebra Tree:

Relational Algebra Tree: Find the data of employees whose last name is 'Snares'.

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Query Visualization:

Duration:

Query visualization of Find the data of employees whose last name is 'Snares' - Duration

Rows:

Query visualization of Find the data of employees whose last name is 'Snares' - Rows

Cost:

Query visualization of Find the data of employees whose last name is 'Snares' - Cost

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Previous: From the following table, write a SQL query to find unique last name of all employees. Return emp_lname.
Next:From the following table, write a SQL query to find the details of the employees who work in the department 57. 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