ORDER BY columns in SELECT list?

According to BOL, columns in an ORDER BY clause do not have to be in the SELECT
column list unless the SELECT includes DISTINCT, or the UNION operator.

Is this a SQL Server thing, or SQL standard behavior? That is, if I were to write
absolutely pure SQL-92, must columns in the ORDER BY clause be present in the SELECT
list?SQL-92 demands the columns specified in the ORDER BY clause be present in
the SELECT list. I guess the recent standards (99, 03 etc) does not have
this requirement.

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- Anith
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