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)

Rishi Rathor

Published on 10-Jan-2019 07:51:16

• Related Questions & Answers
• Add a temporary column in MySQL where the values depend on another column?
• Add an autoincrement column with a custom start value in MySQL
• Add user defined value to a column in a MySQL query?
• Create a temporary table with dates in MySQL
• Performing total of a column in a temporary column in SAP
• Add a new value to a column of data type enum in MySQL?
• Increment column value ‘ADD’ with MySQL SET clause
• MySQL SELECT to sum a column value with previous value
• Order randomly in MySQL with a random value column?
• MySQL SELECT to add a new column to a query and give it a value?
• Create a temporary table in a MySQL procedure?
• Add leading zeros to a MySQL column?
• MySQL query to remove a value with only numbers in a column
• Insert multiple values in a temporary table with a single MySQL query?
• Swap a specific column value in MySQL