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SQL exercises on hospital Database: Count number of unique patients who got an appointment for examination room C

SQL hospital Database: Exercise-14 with Solution

14. From the following tables, write a SQL query to count number of unique patients who got an appointment for examination room ‘C’. Return unique patients as “No. of patients got appointment for room C”..

Sample table: appointment


Sample Solution:

SELECT count(DISTINCT patient) AS "No. of patients got appointment for room C"
FROM appointment
WHERE examinationroom='C';

Sample Output:

No. of patients got appointment for room C 
--------------------------------------------
                                          3
(1 row)

Practice Online


E R Diagram of Hospital Database:

E R Diagram: SQL Hospital Database.

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Previous: From the following tables, write a SQL query to find the patients and the number of physicians they have taken appointment. Return Patient name as "Patient", number of Physicians as "Appointment for No. of Physicians".
Next: From the following tables, write a SQL query to find the name of the patients and the number of the room where they have to go for their treatment. Return patient name as "Patient", examination room as "Room No.", and starting date time as Date "Date and Time of appointment".

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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