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:
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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
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