Please note, this is a STATIC archive of website www.w3resource.com from 19 Jul 2022, cach3.com does not collect or store any user information, there is no "phishing" involved.
w3resource

SQL exercises on hospital Database: Count the number of patients who booked an appointment with at least one physician

SQL hospital Database: Exercise-4 with Solution

4. From the following table, write a SQL query to count the number of patients who booked an appointment with at least one Physician. Return count as "Number of patients taken at least one appointment".

Sample table: appointment


Sample Solution: 

SELECT count(DISTINCT patient) AS "No. of patients taken at least one appointment"
FROM appointment;

Sample Output:

 No. of patients taken at least one appointment
------------------------------------------------
                                              4
(1 row)

Pictorial presentation:

Count the number of patients who booked an appointment with at least one physician

Practice Online


E R Diagram of Hospital Database:

E R Diagram: SQL Hospital Database.

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: From the following tables, write a SQL query to find those physicians who are the head of the department. Return Department name as "Department" and Physician name as "Physician".
Next: From the following table, write a SQL query to find the floor and block where the room number 212 belongs. Return block floor as "Floor" and block code as "Block".

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



SQL: Tips of the Day

SQL Server SELECT into existing table. 

INSERT INTO dbo.TABLETWO
SELECT col1, col2
  FROM dbo.TABLEONE
 WHERE col3 LIKE @search_key

This assumes there's only two columns in dbo.TABLETWO - you need to specify the columns otherwise:

INSERT INTO dbo.TABLETWO
  (col1, col2)
SELECT col1, col2
  FROM dbo.TABLEONE
 WHERE col3 LIKE @search_key

Database: SQL Server

Ref: https://bit.ly/3y6tpA3