MySQL alias cannot be used with *. However, it can be used for individual column. The syntax is as follows −
select anyaliasName.yourColumnName1 as anyaliasName1, anyaliasName.yourColumnName2 as anyaliasName2, anyaliasName.yourColumnName3 as anyaliasName3, anyaliasName.yourColumnName4 as anyaliasName4, . . . . N from yourTableName as anyaliasName;
MySQL alias is a variable of table that can be used to access the column name of that particular table. To understand the above syntax, let us create a table.
The query to create a table is as follows −
mysql> create table TableAliasDemo −> ( −> Id int, −> Name varchar(100), −> Age int −> ); Query OK, 0 rows affected (0.46 sec)
Insert some records using insert command. The query is as follows −
mysql> insert into TableAliasDemo values(1,'John',23); Query OK, 1 row affected (0.13 sec) mysql> insert into TableAliasDemo values(2,'Sam',24); Query OK, 1 row affected (0.23 sec) mysql> insert into TableAliasDemo values(3,'David',26); Query OK, 1 row affected (0.15 sec) mysql> insert into TableAliasDemo values(4,'Carol',20); Query OK, 1 row affected (0.19 sec)
Display all records from the table using select statement. The query is as follows −
mysql> select *from TableAliasDemo;
The following is the output −
+------+-------+------+ | Id | Name | Age | +------+-------+------+ | 1 | John | 23 | | 2 | Sam | 24 | | 3 | David | 26 | | 4 | Carol | 20 | +------+-------+------+ 4 rows in set (0.00 sec)
To create an alias for a table, the following is the query −
mysql> select alias.Id as aliasForIdColumn, −> alias.Name as aliasForNameColumn, −> alias.Age as aliasForAgeColumn −> from TableAliasDemo as alias;
The following is the output −
+------------------+--------------------+-------------------+ | aliasForIdColumn | aliasForNameColumn | aliasForAgeColumn | +------------------+--------------------+-------------------+ | 1 | John | 23 | | 2 | Sam | 24 | | 3 | David | 26 | | 4 | Carol | 20 | +------------------+--------------------+-------------------+ 4 rows in set (0.00 sec)