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MySQL query to get the length of all columns and display the result in a single new column?
To get the length of all columns i.e. the count of all the characters for column values, use char_length(). Let us first create a table. Here, we have two columns, therefore we will calculate for each row consisting of both the values FirstName and LastName −
mysql> create table DemoTable ( FirstName varchar(100), LastName varchar(100) ); Query OK, 0 rows affected (1.07 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('Chris','Brown');
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable values('David','Miller');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable values('Carol','Taylor');
Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −
mysql> select *from DemoTable −
This will produce the following output −
+-----------+----------+ | FirstName | LastName | +-----------+----------+ | Chris | Brown | | David | Miller | | Carol | Taylor | +-----------+----------+ 3 rows in set (0.00 sec)
Following is the query to get the length of all the columns −
mysql> select char_length(concat(FirstName,LastName)) from DemoTable;
This will produce the following output −
+-----------------------------------------+ | char_length(concat(FirstName,LastName)) | +-----------------------------------------+ | 10 | | 11 | | 11 | +-----------------------------------------+ 3 rows in set (0.00 sec)
Updated on: 01-Oct-2019
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