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SQL exercises on hospital Database: Count the number of unavailable rooms

SQL hospital Database: Exercise-7 with Solution

7. From the following table, write a SQL query to count the number of unavailable rooms. Return count as "Number of unavailable rooms".

Sample table: room


Sample Solution: 

SELECT count(*) "Number of unavailable rooms"
FROM room
WHERE unavailable='true';

Sample Output:

Number of unavailable rooms
---------------------------
                         7
(1 row)

Pictorial presentation:

Count the number of unavailable rooms

Practice Online


E R Diagram of Hospital Database:

E R Diagram: SQL Hospital Database.

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Previous: From the following table, write a SQL query to count the number available rooms. Return count as 'Number of available rooms'.
Next: From the following tables, write a SQL query to find the physician and the departments they are affiliated with. Return Physician name as "Physician", and department name as "Department".

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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