Get the size of selected rows in MySQL

To get the size of selected rows, use CHAR_LENGTH(). Let us first create a table −

mysql> create table DemoTable1612    -> (    -> FirstName varchar(20),    -> LastName varchar(20)    -> ); Query OK, 0 rows affected (0.87 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1612 values('David','Brown'); Query OK, 1 row affected (0.75 sec) mysql> insert into DemoTable1612 values('John','Smith'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable1612 values('Bob','Taylor'); Query OK, 1 row affected (0.13 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1612;

This will produce the following output −

+-----------+----------+ | FirstName | LastName | +-----------+----------+ | David     |    Brown | | John      |    Smith | | Bob       |   Taylor | +-----------+----------+ 3 rows in set (0.00 sec)

Following is the query to get the size of selected rows in MySQL −

mysql> select sum(char_length(FirstName)) from DemoTable1612 where LastName IN('Brown','Smith','Taylor');

This will produce the following output −

+-----------------------------+ | sum(char_length(FirstName)) | +-----------------------------+ |                          12 | +-----------------------------+ 1 row in set (0.00 sec)