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 |