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Add a temporary column with a value in MySQL?
You can add a temporary column with value with the help of the following syntax −
select yourColumnName1,yourColumnName2,.....N ,yourTemporaryColumnValue as yourTemporaryColumnName from yourTableName;
To add a temporary column with a value, let us create a table. The following is the query −
mysql> create table TemporaryColumnWithValueDemo −> ( −> StudentId int, −> StudentName varchar(100) −> ); Query OK, 0 rows affected (0.59 sec)
Inserting some records in the table. The query to insert records are as follows −
mysql> insert into TemporaryColumnWithValueDemo values(101,'John'); Query OK, 1 row affected (0.13 sec) mysql> insert into TemporaryColumnWithValueDemo values(102,'Johnson'); Query OK, 1 row affected (0.15 sec) mysql> insert into TemporaryColumnWithValueDemo values(103,'Carol'); Query OK, 1 row affected (0.14 sec) mysql> insert into TemporaryColumnWithValueDemo values(104,'Sam'); Query OK, 1 row affected (0.16 sec)
Display all records inserted above. The query to display all records is as follows −
mysql> select *from TemporaryColumnWithValueDemo;
The following is the output −
+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | 101 | John | | 102 | Johnson | | 103 | Carol | | 104 | Sam | +-----------+-------------+ 4 rows in set (0.00 sec)
Now here is the query to add a column with a t.emporary value. The query is as follows −
mysql> select StudentId,StudentName,'M.I.T.' as TempCollegeName from TemporaryColumnWithValueDemo;
The following is the output. The temporary column added successfully −
+-----------+-------------+-----------------+ | StudentId | StudentName | TempCollegeName | +-----------+-------------+-----------------+ | 101 | John | M.I.T. | | 102 | Johnson | M.I.T. | | 103 | Carol | M.I.T. | | 104 | Sam | M.I.T. | +-----------+-------------+-----------------+ 4 rows in set (0.00 sec)
Updated on: 25-Jun-2020
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