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How to get the longest VarChar length in MySQL?
To get the longest varchar length, you need to use CHAR_LENGTH().
The syntax is as follows
SELECT Max(CHAR_LENGTH(yourColumnName)) AS anyAliasName FROM yourTableName;
To understand the above syntax, let us create a table. The query to create a table is as follows
mysql> create table CharLengthDemo - > ( - > Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, - > Sentence varchar(255) - > ); Query OK, 0 rows affected (0.60 sec)
Insert some records in the table using insert command.
The query is as follows
mysql> insert into CharLengthDemo(Sentence) values('Java is an object oriented programming language'
- > );
Query OK, 1 row affected (0.45 sec)
mysql> insert into CharLengthDemo(Sentence) values('MySQL is a Relational Database Management System');
Query OK, 1 row affected (0.26 sec)
mysql> insert into CharLengthDemo(Sentence) values('JSP uses Java Programming Language');
Query OK, 1 row affected (0.24 sec)
mysql> insert into CharLengthDemo(Sentence) values('Object is a root class in java');
Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement.
The query is as follows
mysql> select *from CharLengthDemo;
The following is the output
+----+--------------------------------------------------+ | Id | Sentence | +----+--------------------------------------------------+ | 1 | Java is an object oriented programming language | | 2 | MySQL is a Relational Database Management System | | 3 | JSP uses Java Programming Language | | 4 | Object is a root class in java | +----+--------------------------------------------------+ 4 rows in set (0.00 sec)
Here is the query to get the longest varchar length
mysql> SELECT Max(CHAR_LENGTH(Sentence)) AS MAXLENGTH FROM CharLengthDemo;
The following is the output displaying the value with the longest varchar length
+-----------+ | MAXLENGTH | +-----------+ | 48 | +-----------+ 1 row in set (0.00 sec)
Updated on: 30-Jul-2019
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