By Sanjay Mishra, Alan Beaulieu
The overwhelming majority of Oracle SQL books speak about a few syntax, give you the barest rudiments of utilizing Oracle SQL, and maybe comprise a couple of uncomplicated examples. it'd be adequate to move a survey direction, or provide you with a few buzz phrases to drop in dialog with genuine Oracle DBAs. but when you employ Oracle SQL frequently, you will want even more. you must entry the total energy of SQL to put in writing queries in an Oracle setting. you will have a pretty good figuring out of what is attainable with Oracle SQL, inventive thoughts for writing powerful and exact queries, and the sensible, hands-on details that ends up in actual mastery of the language. easily placed, you will want valuable, specialist most sensible practices that may be placed to paintings instantly, not only non-vendor particular evaluation or theory.Updated to hide the newest model of Oracle, Oracle 10g, this variation of the very popular Mastering Oracle SQL has a more robust concentrate on process and on Oracle's implementation of SQL than the other ebook out there. It covers Oracle s immense library of integrated services, the entire variety of Oracle SQL query-writing beneficial properties, usual expression help, new mixture and analytic services, subqueries within the decide upon and WITH clauses, multiset union operators, more advantageous help for hierarchical queries: leaf and loop detection, and the CONNECT_BY_ROOT operator, new partitioning equipment (some brought in Oracle9i unencumber 2), and the local XML datatype, XMLType.Mastering Oracle SQL, second version fills the distance among the occasionally spotty seller documentation, and different books on SQL that simply do not discover the complete intensity of what's attainable with Oracle-specific SQL. in the event you are looking to harness the untapped (and usually ignored) strength of Oracle SQL, this crucial consultant for placing Oracle SQL to paintings will turn out invaluable.
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Additional info for Mastering Oracle SQL, 2nd Edition
Part_nbr) daily_part_usage FROM half p the place p. inventory_qty > zero) elements; nation Transitions every so often, the order within which the values could be replaced is restricted in addition to the allowable values for a column. think about the diagram proven in determine 9-1, which indicates the allowable country transitions for an order. Figure 9-1. Order processing nation transitions As you will see that, an order at present within the Processing kingdom should still in simple terms be allowed to maneuver to both behind schedule or stuffed. instead of permitting every one software to enforce common sense to alter the country of an order, write a user-defined functionality that returns the precise country counting on the present kingdom of the order and the transition style. during this instance, transition forms are outlined: confident (POS) and destructive (NEG). for instance, an order within the not on time nation could make a good transition to Processing or a unfavorable transition to Cancelled. If an order is in a single of the ultimate states (Rejected, Cancelled, Shipped), an analogous nation is again. this is the DECODE model of the PL/SQL functionality: functionality get_next_order_state(ord_nbr in quantity, trans_type in VARCHAR2 DEFAULT 'POS') go back VARCHAR2 is next_state VARCHAR2(20) := 'UNKNOWN'; commence opt for DECODE(status, 'REJECTED', prestige, 'CANCELLED', prestige, 'SHIPPED', prestige, 'NEW', DECODE(trans_type, 'NEG', 'AWAIT_PAYMENT', 'PROCESSING'), 'AWAIT_PAYMENT', DECODE(trans_type, 'NEG', 'REJECTED', 'PROCESSING'), 'PROCESSING', DECODE(trans_type, 'NEG', 'DELAYED', 'FILLED'), 'DELAYED', DECODE(trans_type, 'NEG', 'CANCELLED', 'PROCESSING'), 'FILLED', DECODE(trans_type, 'POS', 'SHIPPED', 'UNKNOWN'), 'UNKNOWN') INTO next_state FROM cust_order the place order_nbr = ord_nbr; go back next_state; EXCEPTION whilst NO_DATA_FOUND THEN go back next_state; finish get_next_order_state;As of Oracle8i, the PL/SQL language doesn't contain the CASE expression in its grammar, so that you would have to be working Oracle9i or later to take advantage of the CASE model of the functionality: functionality get_next_order_state(ord_nbr in quantity, trans_type in VARCHAR2 DEFAULT 'POS') go back VARCHAR2 is next_state VARCHAR2(20) := 'UNKNOWN'; commence decide upon CASE while prestige = 'REJECTED' THEN prestige whilst prestige = 'CANCELLED' THEN prestige whilst prestige = 'SHIPPED' THEN prestige while prestige = 'NEW' AND trans_type = 'NEG' THEN 'AWAIT_PAYMENT' while prestige = 'NEW' AND trans_type = 'POS' THEN 'PROCESSING' whilst prestige = 'AWAIT_PAYMENT' AND trans_type = 'NEG' THEN 'REJECTED' while prestige = 'AWAIT_PAYMENT' AND trans_type = 'POS' THEN 'PROCESSING' whilst prestige = 'PROCESSING' AND trans_type = 'NEG' THEN 'DELAYED' while prestige = 'PROCESSING' AND trans_type = 'POS' THEN 'FILLED' whilst prestige = 'DELAYED' AND trans_type = 'NEG' THEN 'CANCELLED' while prestige = 'DELAYED' AND trans_type = 'POS' THEN 'PROCESSING' while prestige = 'FILLED' AND trans_type = 'POS' THEN 'SHIPPED' ELSE 'UNKNOWN' finish INTO next_state FROM cust_order the place order_nbr = ord_nbr; go back next_state; EXCEPTION while NO_DATA_FOUND THEN go back next_state; finish get_next_order_state;This instance handles in simple terms the straightforward case during which there are only paths out of every country, however it does display one approach for handling country transitions on your database.