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How to SELECT * and rename a column in MySQL?
Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(20), Age int ); Query OK, 0 rows affected (1.15 sec)
Insert records in the table using insert command −
mysql> insert into DemoTable(Name,Age) values('John',21);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(Name,Age) values('Carol',24);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(Name,Age) values('David',22);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable(Name,Age) values('Sam',23);
Query OK, 1 row affected (0.23 sec)Display all records from the table using select statement −
mysql> select * from DemoTable;
This will produce the following output −
+----+-------+------+ | Id | Name | Age | +----+-------+------+ | 1 | John | 21 | | 2 | Carol | 24 | | 3 | David | 22 | | 4 | Sam | 23 | +----+-------+------+ 4 rows in set (0.00 sec)
Following is the query to SELECT * and rename a column −
mysql> select tbl.*,Name AS StudentName from DemoTable tbl;
This will produce the following output −
+----+-------+------+-------------+ | Id | Name | Age | StudentName | +----+-------+------+-------------+ | 1 | John | 21 | John | | 2 | Carol | 24 | Carol | | 3 | David | 22 | David | | 4 | Sam | 23 | Sam | +----+-------+------+-------------+ 4 rows in set (0.00 sec)
Updated on 30-Jul-2019 22:30:26
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