SQL Alias

There are two types of aliases that are used most frequently in SQL command: which is column alias and table alias.

Why ALIAS? There is some reasons alias to be use when querying a SQL command.

- alias in a long query can make your query easier to read and understand

- alias table is use when using a same table in one query

- alias column is to identify the column naming when used together with aggregate functions, then the column can be understand easily

Syntax for Column Name Alias is :

SELECT [COLUMN NAME] AS COLUMN_ALIAS FROM [TABLE NAME]

Syntax for Table Name Alias is :

SELECT [COLUMN NAME] FROM [TABLE NAME] AS TABLE_ALIAS

Example will using this table : Table GameScores

PlayerName	Department	Scores
Jason	IT	3000
Irene	IT	1500
Jane	Marketing	1000
David	Marketing	2500
Paul	HR	2000
James	HR	2000

EXAMPLE for Column Name Alias :

let's say we want to refer to a simple example that just change the table name as DepartmentGameScores

SQL statement :

SELECT * FROM GameScores AS DepartmentGameScores

Result:

Table DepartmentGameScores

PlayerName	Department	Scores
Jason	IT	3000
Irene	IT	1500
Jane	Marketing	1000
David	Marketing	2500
Paul	HR	2000
James	HR	2000

EXAMPLE for Table Name Alias :

let's say we want to refer to a simple example which is return sum of the scores in the table. this example is taken from SQL SUM

SQL statement :

SELECT SUM(Scores) AS Total_score
FROM GameScores

Result:

Total_score

12000