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SQLite Alias

You can temporarily rename a table or column to another name, which is known as an alias. Using a table alias means renaming a table within a specific SQLite statement. The renaming is a temporary change, and the actual name of the table in the database remains unchanged.

A column alias is used to rename a column in a table for a specific SQLite statement.

Syntax

The basic syntax for table aliases is as follows:

SELECT column1, column2....
FROM table_name AS alias_name
WHERE [condition];

The basic syntax for column aliases is as follows:

SELECT column_name AS alias_name
FROM table_name
WHERE [condition];

Example

Suppose there are two tables, (1) the COMPANY table as shown below:

sqlite> select * from COMPANY;
ID          NAME                  AGE         ADDRESS     SALARY
----------  --------------------  ----------  ----------  ----------
1           Paul                  32          California  20000.0
2           Allen                 25          Texas       15000.0
3           Teddy                 23          Norway      20000.0
4           Mark                  25          Rich-Mond   65000.0
5           David                 27          Texas       85000.0
6           Kim                   22          South-Hall  45000.0
7           James                 24          Houston     10000.0

(2) Another table is DEPARTMENT, as shown below:

ID          DEPT                  EMP_ID
----------  --------------------  ----------
1           IT Billing            1
2           Engineering           2
3           Finance               7
4           Engineering           3
5           Finance               4
6           Engineering           5
7           Finance               6

Now, here is the usage of table aliases, where we use C and D as aliases for the COMPANY and DEPARTMENT tables respectively:

sqlite> SELECT C.ID, C.NAME, C.AGE, D.DEPT
        FROM COMPANY AS C, DEPARTMENT AS D
        WHERE  C.ID = D.EMP_ID;

The above SQLite statement will produce the following result:

ID          NAME        AGE         DEPT
----------  ----------  ----------  ----------
1           Paul        32          IT Billing
2           Allen       25          Engineering
3           Teddy       23          Engineering
4           Mark        25          Finance
5           David       27          Engineering
6           Kim         22          Finance
7           James       24          Finance

Let's look at an example of column aliases, where COMPANY_ID is an alias for the ID column, and COMPANY_NAME is an alias for the name column:

sqlite> SELECT C.ID AS COMPANY_ID, C.NAME AS COMPANY_NAME, C.AGE, D.DEPT
        FROM COMPANY AS C, DEPARTMENT AS D
        WHERE  C.ID = D.EMP_ID;

The above SQLite statement will produce the following result:

COMPANY_ID  COMPANY_NAME  AGE         DEPT
----------  ------------  ----------  ----------
1           Paul          32          IT Billing
2           Allen         25          Engineering
3           Teddy         23          Engineering
4           Mark          25          Finance
5           David         27          Engineering
6           Kim           22          Finance
7           James         24          Finance
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