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Concatenate two values from the same column with different conditions in MySQL
For this, you can use group_concat() with aggregate function. Let us first create a table −
mysql> create table DemoTable1869 ( Id int, Subject varchar(20 ), Name varchar(20) ); Query OK, 0 rows affected (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1869 values(100,'MySQL','John'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1869 values(100,'MongoDB','Smith'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1869 values(101,'MySQL','Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1869 values(101,'MongoDB','Brown'); Query OK, 1 row affected (0.00 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable1869;
This will produce the following output −
+------+---------+-------+ | Id | Subject | Name | +------+---------+-------+ | 100 | MySQL | John | | 100 | MongoDB | Smith | | 101 | MySQL | Chris | | 101 | MongoDB | Brown | +------+---------+-------+ 4 rows in set (0.00 sec)
Here is the query to concatenate 2 values from the same column with different conditions −
mysql> select Id,concat(StudentFirstName,'',StudentLastName) from ( select Id, max(case when Subject='MySQL' then Name end) as StudentFirstName, max(case when Subject='MongoDB' then Name end) as StudentLastName from DemoTable1869 group by Id )tbl;
This will produce the following output −
+------+---------------------------------------------+ | Id | concat(StudentFirstName,'',StudentLastName) | +------+---------------------------------------------+ | 100 | JohnSmith | | 101 | ChrisBrown | +------+---------------------------------------------+ 2 rows in set (0.00 sec)
Updated on: 26-Dec-2019
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