SELECT Statement in SharePoint Search SQL Syntax

You specify what information to return in the <columns> specification. You must specify at least one column of information to retrieve.

Note
SharePoint Server search does not support using column aliases.

Following is the columns portion of the SELECT clause syntax:

<column> [ {, <column>} … ]

Separate multiple column specifiers by using commas. Column names can be either regular or delimited identifiers. When the query returns a document that does not have the requested column, the value of that column for the document is NULL.

In the SQL query, you are allowed to use the asterisk (*) to specify that all columns in a table are to be returned. However, no defined and fixed set of properties applies to all documents. For this reason, the SQL asterisk is not permitted in the <columns> setting.

Note
SharePoint Server search does not support the following: column aliasing; casting the column data type as it is returned in the query; limiting the column length (the full length of each text property is returned).

Reference

Concepts