Mastering Oracle SQL, 2nd Edition

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 easy examples. it'd be adequate to go a survey direction, or provide you with a few buzz phrases to drop in dialog with actual Oracle DBAs. but when you utilize Oracle SQL frequently, you will want even more. you must entry the entire energy of SQL to write down queries in an Oracle atmosphere. you will want a superior figuring out of what is attainable with Oracle SQL, inventive concepts for writing potent and exact queries, and the sensible, hands-on details that results in real mastery of the language. easily placed, you will have worthwhile, specialist top practices that may be positioned to paintings instantly, not only non-vendor particular evaluate or theory.Updated to hide the most recent model of Oracle, Oracle 10g, this version of the very hot Mastering Oracle SQL has a far better concentrate on procedure and on Oracle's implementation of SQL than the other ebook out there. It covers Oracle s substantial library of integrated services, the complete variety of Oracle SQL query-writing beneficial properties, standard expression help, new mixture and analytic features, subqueries within the decide on and WITH clauses, multiset union operators, greater aid for hierarchical queries: leaf and loop detection, and the CONNECT_BY_ROOT operator, new partitioning equipment (some brought in Oracle9i free up 2), and the local XML datatype, XMLType.Mastering Oracle SQL, second variation fills the space among the occasionally spotty seller documentation, and different books on SQL that simply do not discover the total intensity of what's attainable with Oracle-specific SQL. in the event you are looking to harness the untapped (and usually ignored) energy of Oracle SQL, this crucial advisor for placing Oracle SQL to paintings will turn out invaluable.

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Order_nbr = c. order_nbr; View created. within the view v_cust_disputed_ord either the tables are key-preserved, as the key of every of the tables can also be a key of the end result set of the subscribe to. Now test deleting a row from this view: DELETE FROM v_cust_disputed_ord the place order_nbr = 1003; 1 row deleted. due to the fact that there are key-preserved tables, which desk did the row get deleted from? After querying the person tables, you can find row has been deleted from the disputed_orders desk. Why? this can be a bit tough. the guideline is if you try and delete a row from a sign up for view having multiple key-preserved desk, the row can be deleted from the 1st desk within the sign up for. for those who opposite the order of the tables within the subscribe to, after which factor a delete, you'll find that the row may be deleted from the cust_order desk. this is often unusual, yet it is the rule. retain this unforeseen habit in brain should you write functions that have to delete from a subscribe to view with a number of key-preserved tables. replace Statements on a subscribe to View An replace operation could be played on a subscribe to view if it makes an attempt to replace a column within the key-preserved desk. for instance: replace v_rtlr_emp SET identify = 'PRO activities' the place rtlr_nbr = 215; 1 row up to date. This replace is profitable because it up-to-date the identify column of the shop desk, that is key-preserved. although, the subsequent replace assertion will fail since it makes an attempt to change the sales_rep column that maps to the worker desk, that's non-key-preserved: replace v_rtlr_emp SET sales_rep = 'ANDREW' the place rtlr_nbr = 214; SET sales_rep = 'ANDREW' * errors at line 2: ORA-01779: can't adjust a column which maps to a non-key-preserved desk info Dictionary perspectives to discover Updatable Columns Oracle presents the knowledge dictionary view USER_UPDATABLE_COLUMNS that exhibits all modifiable columns in all tables and perspectives in a user's schema. this is worthwhile when you've got a view that you just desire to replace, yet are usually not yes no matter if it truly is updatable. USER_UPDATABLE_COLUMNS has the next definition: DESC USER_UPDATABLE_COLUMNS identify Null? style -------------- -------- ------------- proprietor no longer NULL VARCHAR2(30) TABLE_NAME now not NULL VARCHAR2(30) COLUMN_NAME now not NULL VARCHAR2(30) UPDATABLE VARCHAR2(3) INSERTABLE VARCHAR2(3) DELETABLE VARCHAR2(3)Tip ALL_UPDATABLE_COLUMNS exhibits modifiable columns from all of the perspectives you could entry (as against simply these you own), and DBA_UPDATABLE_COLUMNS (for DBAs simply) exhibits such columns for all of the perspectives within the database. the subsequent instance indicates USER_UPDATABLE_COLUMNS being queried for an inventory of updatable columns within the v_rtlr_emp view: choose * FROM USER_UPDATABLE_COLUMNS the place TABLE_NAME = 'V_RTLR_EMP'; proprietor TABLE_NAME COLUMN_NAME UPD INS DEL ------- ------------- ---------------- --- --- DEMO V_RTLR_EMP RTLR_NBR sure definite definite DEMO V_RTLR_EMP identify definite certain certain DEMO V_RTLR_EMP urban sure convinced sure DEMO V_RTLR_EMP EMP_ID NO NO NO DEMO V_RTLR_EMP SALESPERSON_ID sure sure definite DEMO V_RTLR_EMP SALES_REP NO NO NO influence of WITH fee choice WITH cost alternative is an non-compulsory clause within the CREATE VIEW assertion that stops any alterations to the knowledge within the view that may reason rows to be now not incorporated within the view.

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