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Help Center/ Data Lake Insight/ SQL Syntax Reference (To Be Offline)/ Spark SQL Syntax Reference (Unavailable Soon)/ Alias/ AS for Column

AS for Column

Updated on 2023-11-03 GMT+08:00

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Function

This statement is used to specify an alias for a column.

Syntax

1	SELECT attr_expr [AS] alias, attr_expr [AS] alias, ... FROM table_reference;

Keyword

alias: gives an alias for the attr_expr field.
AS: Whether to add AS does not affect the result.

Precautions

The to-be-queried table must exist. Otherwise, an error is reported.
The alias must be specified before execution of the statement. Otherwise, an error is reported. You are advised to specify a unique alias.

Example

Run SELECT name AS n FROM simple_table WHERE score > 90 to obtain the subquery result. The alias n for name can be used by external SELECT statement.

1	SELECT n FROM (SELECT name AS n FROM simple_table WHERE score > 90) m WHERE n = "xiaoming";

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