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Using CASE statement in MySQL to display custom name for empty value
For this, you can use CASE WHEN statement. Let us first create a table −
mysql> create table DemoTable -> ( -> Name varchar(20) -> ); Query OK, 0 rows affected (0.62 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('Chris');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values('David');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable values('');
Query OK, 1 row affected (0.11 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-------+ | Name | +-------+ | Chris | | | | David | | | +-------+ 4 rows in set (0.00 sec)
Following is the query to display custom name for empty values −
mysql> select case trim(ifnull(Name,'')) -> when '' then 'Carol Taylor' -> else -> Name -> end as Name -> from DemoTable;
This will produce the following output −
+--------------+ | Name | +--------------+ | Chris | | Carol Taylor | | David | | Carol Taylor | +--------------+ 4 rows in set (0.03 sec)
Updated on: 13-Dec-2019
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