SQL Exercise: Find the floor and block with a given room number

Last update on December 20 2024 11:41:50 (UTC/GMT +8 hours)

5. From the following table, write a SQL query to locate the floor and block where room number 212 is located. Return block floor as "Floor" and block code as "Block".

roomnumber | roomtype | blockfloor | blockcode | unavailable
-----------+----------+------------+-----------+-------------
       101 | Single   |          1 |         1 | f
       102 | Single   |          1 |         1 | f
       103 | Single   |          1 |         1 | f
       111 | Single   |          1 |         2 | f
       112 | Single   |          1 |         2 | t
       113 | Single   |          1 |         2 | f
       121 | Single   |          1 |         3 | f
       122 | Single   |          1 |         3 | f
       123 | Single   |          1 |         3 | f
       201 | Single   |          2 |         1 | t
       202 | Single   |          2 |         1 | f
       203 | Single   |          2 |         1 | f
       211 | Single   |          2 |         2 | f
       212 | Single   |          2 |         2 | f
       213 | Single   |          2 |         2 | t
       221 | Single   |          2 |         3 | f
       222 | Single   |          2 |         3 | f
       223 | Single   |          2 |         3 | f
       301 | Single   |          3 |         1 | f
       302 | Single   |          3 |         1 | t
       303 | Single   |          3 |         1 | f
       311 | Single   |          3 |         2 | f
       312 | Single   |          3 |         2 | f
       313 | Single   |          3 |         2 | f
       321 | Single   |          3 |         3 | t
       322 | Single   |          3 |         3 | f
       323 | Single   |          3 |         3 | f
       401 | Single   |          4 |         1 | f
       402 | Single   |          4 |         1 | t
       403 | Single   |          4 |         1 | f
       411 | Single   |          4 |         2 | f
       412 | Single   |          4 |         2 | f
       413 | Single   |          4 |         2 | f
       421 | Single   |          4 |         3 | t
       422 | Single   |          4 |         3 | f
       423 | Single   |          4 |         3 | f

Sample Solution:

SELECT blockfloor AS "Floor",
       blockcode AS "Block"
FROM room
WHERE roomnumber=212;

Sample Output:

 Floor | Block
-------+-------
     2 |     2
(1 row)

Explanation:

The said query in SQL that selects the "blockfloor" and "blockcode" columns from the 'room' table where the "roomnumber" is equal to 212.

The "blockfloor" column aliased as "Floor" and the "blockcode" column aliased as "Block".

Pictorial presentation:

Practice Online

E R Diagram of Hospital Database:

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