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SQL exercises on hospital Database: Count the number available rooms

SQL hospital Database: Exercise-6 with Solution

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

Sample table: room


Sample Solution: 

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

Sample Output:

 Number of available rooms
---------------------------
                        29
(1 row)

Pictorial presentation:

Count the number available 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 find the floor and block where the room number 212 belongs. Return block floor as "Floor" and block code as "Block".
Next: From the following table, write a SQL query to count the number of unavailable rooms. Return count as "Number of unavailable rooms".

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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