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Column specification (column_spec) 

A column specification ( column_spec ) specifies a column in a table.

Syntax

<column_spec> ::= <column_name> | <table_name>.<column_name>
| <reference_name>.<column_name> | <result_table name>.<column_name>

column_name, table_name, reference_name, result_table_name

Explanation

For all names consisting of several identifiers separated by a ".", any number of blanks can be specified before and after the dot.

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