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Remove specific fields/ rows and show other records in MySQL?
For this, use CASE WHEN statement in MySQL. Let us create a table −
mysql> create table demo47 −> ( −> first_name varchar(20), −> last_name varchar(20) −> ); Query OK, 0 rows affected (1.57 sec)
Insert some records into the table with the help of insert command −
mysql> insert into demo47 values('John','Smith'); Query OK, 1 row affected (0.18 sec) mysql> insert into demo47 values('David','Miller'); Query OK, 1 row affected (0.11 sec) mysql> insert into demo47 values('John','Doe'); Query OK, 1 row affected (0.12 sec) mysql> insert into demo47 values('Chris','Brown'); Query OK, 1 row affected (0.12 sec)
Display records from the table using select statement −
mysql> select *from demo47;
This will produce the following output −
+------------+-----------+ | first_name | last_name | +------------+-----------+ | John | Smith | | David | Miller | | John | Doe | | Chris | Brown | +------------+-----------+ 4 rows in set (0.00 sec)
Following is the query to remove specific fields/ rows and display other records in MySQL.
mysql> select case when first_name= 'John' then last_name else first_name end Result −> from demo47 −> where 'John' in (first_name,last_name);
This will produce the following output −
+--------+ | Result | +--------+ | Smith | | Doe | +--------+ 2 rows in set (0.00 sec)
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