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How to use CHAR_LENGTH() in MySQL CREATE TABLE query?
Use CHAR_LENGTH(yourColumnName) at the time of table creation. Let us first see an example and create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Title varchar(200), `Number_of_characters` int as (char_length(Title)) ); Query OK, 0 rows affected (0.18 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(Title) values('Introduction To MySQL');
Query OK, 1 row affected (0.06 sec)
mysql> insert into DemoTable(Title) values('Introduction To Java');
Query OK, 1 row affected (0.06 sec)
mysql> insert into DemoTable(Title) values('Introduction To MongoDB');
Query OK, 1 row affected (0.04 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+----+-------------------------+----------------------+ | Id | Title | Number_of_characters | +----+-------------------------+----------------------+ | 1 | Introduction To MySQL | 21 | | 2 | Introduction To Java | 20 | | 3 | Introduction To MongoDB | 23 | +----+-------------------------+----------------------+ 3 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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