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SQL: Select all columns that satisfy a specific condition

SQL Basic Select Statement: Exercise-10 with Solution.

From the following table, write a SQL query to find customers whose grade is 200. Return customer_id, cust_name, city, grade, salesman_id.

Sample table: customer


Sample Solution:

SELECT *FROM customer
WHERE grade=200;

Output of the Query:

customer_id	cust_name	 city	    grade	salesman_id
3007		Brad Davis	New York	200		5001
3005		Graham Zusi	California	200		5002
3003		Jozy Altidor    Moscow		200		5007

Relational Algebra Expression:

Relational Algebra Expression: Select all columns against a specified condition

Relational Algebra Tree:

Relational Algebra Tree: Select all columns against a specified condition

Explanation :

Explanation: Select all columns against a specified condition

Pictorial presentation :

Result of select all columns against a specified condition

Practice Online


Query Visualization:

Duration:

Query visualization of Select all columns against a specified condition - Duration

Rows:

Query visualization of Select all columns against a specified condition - Rows

Cost:

Query visualization of Select all columns against a specified condition - Cost

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Previous: From the following table, write a SQL query to find the salespeople who lives in the City of 'Paris'. Return salesperson's name, city..
Next: From the following table, write a SQL query to find the orders, which are delivered by a salesperson of ID. 5001. Return ord_no, ord_date, purch_amt.

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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