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Table
Reference 
A table reference is a table name with an optional table alias. Table references are used in the FROM clause of a query specification, of the SELECT FOR UPDATE statement and of the SELECT INTO statement. If a table alias has been introduced, the alias must be used in the entire scope of the alias instead of the table name.

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<table reference> ::= <table name>
<table name> ::= <identifier>.
<table alias> ::= <identifier>. |

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SELECT employee_name FROM employees AS e WHERE e.employee_id = 123 |
Table Alias.For the table employeesthe alias e is introduced in the FROM clause. This alias has to be used in the WHERE clause instead of the table name.
