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MySQL query to convert height format to centimeters?
For this, use the CAST() method in MySQL. Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentHeight varchar(40) ) ; Query OK, 0 rows affected (0.47 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(StudentHeight) values('5\'10\"');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(StudentHeight) values('4\'6\"');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(StudentHeight) values('5\'8\"');
Query OK, 1 row affected (0.10 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+----+---------------+ | Id | StudentHeight | +----+---------------+ | 1 | 5'10" | | 2 | 4'6" | | 3 | 5'8" | +----+---------------+ 3 rows in set (0.00 sec)
Following is the query to convert height format to centimeters −
mysql> select
(cast(substr(StudentHeight,1,locate("'",StudentHeight)-1) as unsigned)*30.48)+
(cast(substr(StudentHeight,locate("'",StudentHeight)+1) as unsigned)*2.54) AS Centimeters
from DemoTable;This will produce the following output −
+-------------+ | Centimeters | +-------------+ | 177.80 | | 137.16 | | 172.72 | +-------------+ 3 rows in set, 3 warnings (0.05 sec)
Updated on: 04-Oct-2019
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