FROM Clause
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Syntax Element … |
Specifies … |
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FROM table_name |
the name of a derived table, joined table, or view in the subquery referenced by the predicate of the WHERE clause. If a row from delete_table is joined with a row from another table in the FROM clause, and the specified WHERE condition for the request evaluates to TRUE for that joined row, then the row in delete_table is deleted; else it is not. See “Rules for Using Scalar Subqueries in a DELETE Statement” on page 328 for the rules for using a scalar subquery for a derived table. If you do not specify a FROM clause, then you cannot use correlation names (compare “Example 10: Join Condition DELETE With FROM Clause and Correlation Name” on page 336 and “Example 11: Join Condition DELETE With No FROM Clause” on page 336). You should also specify the names of all outer tables, including the table from which rows are to be deleted. |
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AS correlation_name |
an optional table alias name. You must specify a correlation name for each table specified in a self-join. ANSI calls table aliases correlation names. They are also referred to as range variables. |