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 number of basic 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 usually, you will have even more. you need to entry the total energy of SQL to jot down queries in an Oracle surroundings. you will want a pretty good knowing of what is attainable with Oracle SQL, artistic thoughts for writing powerful and actual queries, and the sensible, hands-on details that ends up in real mastery of the language. easily positioned, you will want important, specialist most sensible practices that may be positioned to paintings instantly, not only non-vendor particular review or theory.Updated to hide the newest model of Oracle, Oracle 10g, this version of the extremely popular Mastering Oracle SQL has a better specialise in strategy and on Oracle's implementation of SQL than the other e-book out there. It covers Oracle s massive library of integrated capabilities, the entire variety of Oracle SQL query-writing positive aspects, typical expression help, new combination and analytic features, subqueries within the decide on and WITH clauses, multiset union operators, more advantageous aid for hierarchical queries: leaf and loop detection, and the CONNECT_BY_ROOT operator, new partitioning tools (some brought in Oracle9i unencumber 2), and the local XML datatype, XMLType.Mastering Oracle SQL, 2d version fills the space 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 case you are looking to harness the untapped (and usually neglected) strength of Oracle SQL, this crucial advisor for placing Oracle SQL to paintings will turn out invaluable.
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Extra resources for Mastering Oracle SQL, 2nd Edition
TO_DATE, TO_TIMESTAMP, and TO_TIMESTAMP_TZ TO_DATE, TO_TIMESTAMP, and TO_TIMESTAMP_TZ are integrated SQL capabilities that convert, respectively, a personality string right into a DATE, a TIMESTAMP, and a TIMESTAMP WITH TIME quarter. enter to those services should be string literals, PL/SQL variables, and database columns of the CHAR and VARCHAR2 info varieties. those 3 conversion features are related in operation. the adaptation is simply within the info kind of the go back worth. You name them as follows: TO_DATE(string [,format]) TO_TIMESTAMP (string [,format]) TO_TIMESTAMP_TZ (string [,format])The syntax components are: string Specifies a string literal, a PL/SQL variable, or a database column containing personality information (or even numeric facts) convertible to a date or timestamp. layout Specifies the structure of the enter string. The structure has to be a legitimate mixture of structure codes proven in desk 6-1, which you will locate later in part 6. five. in the course of the layout argument, Oracle offers loads of flexibility in terms of changing among date and time values and textual content. Oracle offers way more flexibility, a minimum of in our adventure, than do competing structures, equivalent to DB2 and SQL Server. Specifying a layout is non-compulsory. if you do not specify a layout, the enter string is thought to be in a default layout as laid out in the NLS_DATE_FORMAT, NLS_TIMESTAMP_FORMAT, or NLS_TIMESTAMP_TZ parameter settings. Tip you could view your present NLS parameter settings by way of querying the view named NLS_SESSION_PARAMETERS. utilizing the default codecs each Oracle consultation has a collection of default codecs to exploit in changing date and timestamp values to and from their textual representations. you could question the NLS_SESSION_PARAMETERS view as follows to work out the default codecs at present in impression: opt for parameter, price FROM nls_session_parameters the place parameter LIKE '%FORMAT'; PARAMETER price ------------------------------ ------------------------------ NLS_DATE_FORMAT DD-MON-RR NLS_TIME_FORMAT HH. MI. SSXFF AM NLS_TIMESTAMP_FORMAT DD-MON-RR HH. MI. SSXFF AM NLS_TIME_TZ_FORMAT HH. MI. SSXFF AM TZR NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH. MI. SSXFF AM TZRSession-specific codecs derive from settings for language and territory. for those who attach with no specifying a language and territory, your consultation will inherit the default conversion codecs verified for the database. you could question NLS_DATABASE_PARAMETERS for these. in case you invoke one of many TO_ conversion services, say TO_DATE, with out explicitly specifying a layout, Oracle expects your enter string to be within the default structure for the objective info style. the next INSERT assertion converts a string within the default date structure right into a DATE, that is then inserted into the worker desk: INSERT INTO worker (emp_id, fname, lname, dept_id, manager_emp_id, wage, hire_date) VALUES (2304, 'John', 'Smith', 20, 1258, 20000, TO_DATE('22-OCT-99')); 1 row created. decide upon * FROM worker; EMP_ID FNAME LNAME DEPT_ID MANAGER_EMP_ID wage HIRE_DATE ------- -------- ------- ---------- -------------- ---------- --------- 2304 John Smith 20 1258 20000 22-OCT-99The hire_date column, into which our date used to be inserted, is of style DATE.