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MySQL query to display only the column values with corresponding column having whitespace
For this, use the TRIM() function. Let us first create a table −
mysql> create table DemoTable826( FirstName varchar(100), Age int ); Query OK, 0 rows affected (0.60 sec)
Insert some records in the table using the insert command. Here, we have set the FirstName as whitespace for some of the records −
mysql> insert into DemoTable826 values(' ',24);
Query OK, 1 row affected (0.08 sec)
mysql> insert into DemoTable826 values(' ',22);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable826 values('Chris',26);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable826 values('Robert',27);
Query OK, 1 row affected (0.07 sec)Display all records from the table using select statement −
mysql> select *from DemoTable826 ;
This will produce the following output −
+-----------+------+ | FirstName | Age | +-----------+------+ | Adam | 21 | | | 24 | | | 22 | | Chris | 26 | | Robert | 27 | +-----------+------+ 5 rows in set (0.00 sec)
Following is the query to display only the column values with the corresponding column having whitespace −
mysql> select *from DemoTable826 where COALESCE(TRIM(FirstName), '') = '';
This will produce the following output −
+-----------+------+ | FirstName | Age | +-----------+------+ | | 24 | | | 22 | +-----------+------+ 2 rows in set (0.00 sec)
Updated on: 03-Sep-2019
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