This is the ANSI syntax for joining tables:
left_table [inner | left [outer] | right [outer]] join right_table on left_column_name = right_column_name
The result of the join between the left and the right tables is called a joined table. Joined tables are defined in the from clause. For example:
select titles.title_id, title, ord_num, qty from titles left join salesdetail on titles.title_id = salesdetail.title_id
title_id title ord_num qty ----------------------------- -------------------- ----- BU1032 The Busy Executive AX-532-FED-452-2Z7 200 BU1032 The Busy Executive NF-123-ADS-642-9G3 1000 . . . TC7777 Sushi, Anyone? ZD-123-DFG-752-9G8 1500 TC7777 Sushi, Anyone? XS-135-DER-432-8J2 1090 (118 rows affected)
ANSI join syntax allows you to write either:
Inner joins, in which the joined table includes only the rows of the inner and outer tables that meet the conditions of the on clause. For information, see “ANSI inner joins”. The result set of a query that includes an inner join does not include any null-supplied rows for the rows of the outer table that do not meet the conditions of the on clause.
Outer joins, in which the joined table includes all the rows from the outer table whether or not they meet the conditions of the on clause. If a row does not meet the conditions of the on clause, values from the inner table are stored in the joined table as null values. The where clause of an ANSI outer join restricts the rows that are included in the query result. For more information, see “ANSI outer joins”.
You can also use ANSI syntax to join views.
Sybase ANSI join syntax does not support the using clause.
| Copyright © 2005. Sybase Inc. All rights reserved. |
|
|
