Get Advanced SQL functions in Oracle 10g PDF

By Richard Walsh Earp, Sikha Saha Bagui

ISBN-10: 818333184X

ISBN-13: 9788183331845

Как известно, в Oracle 10g в репертуар инструкций языка SQL добавились новые возможности, делающие его ещё более мощным. Цель этой книги - самым доступным способом ознакомить программистов баз данных с этими новыми возможностями языка, чтобы они могли с успехом их применять в своей работе. Авторы снабдили каждую главу многочисленными работающими примерами для того, чтобы читатели могли сразу же опробовать новые возможности в процессе работы с книгой. Многие книги по Oracle 10g рассказывают только про синтаксис языка. В отличие от них, в этой книге кроме простого описания синтаксиса новых команд и функций авторы также дают совершенно ясное и детальное описание того, как эти функции работают и примеры как можно и нужно их использовать.

Сразу предупреждаю, что эта книга не расчитана на обучение языку SQL "с нуля". Предполагается, что читатель уже имеет опыт работы с Oracle, SQL*Plus и, в некоторых случаях, с PL/SQL. Основной упор в этой книге сделан именно на обучение новым возможностям Oracle 10g тех людей, которые перешли на "десятку" с более ранних версий. Вот что говорят о книге сами авторы:
This booklet normally addresses complex themes in SQL with a spotlight on SQL capabilities for Oracle 10g. The features and techniques we hide comprise the analytical services, version statements, average expressions, and object-oriented/collection constructions. We additionally introduce and provides examples of the SQL/XML bridges as XML is a more moderen and customary approach to moving info from person to consumer. we depend seriously on examples, as so much SQL programmers can and do adapt examples to different difficulties quickly.

Насколько я знаю, книга на русский язык не переводилась.

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We must format dates to see all of the information contained in a date. , convert to a character string) is full of possibilities. ) Here is an example: SELECT TO_CHAR(SYSDATE, 'dd Mon, yyyy hh24:mi:ss') FROM dual 27 Common Oracle Functions: A Function Review This gives: TO_CHAR(SYSDATE,'DDMO --------------------10 Sep, 2006 14:04:59 This presentation gives us not only the date in “dd Mon yyyy” format, but also gives us the time in 24-hour hours, minutes, and seconds. We can add months to any date with the ADD_ MONTHS function like this: SELECT TO_CHAR(SYSDATE, 'ddMONyyyy') Today, TO_CHAR(ADD_MONTHS(SYSDATE, 3), 'ddMONyyyy') "+ 3 mon", TO_CHAR(ADD_MONTHS(SYSDATE, -23), 'ddMONyyyy') "- 23 mon" FROM dual This will give us: TODAY + 3 mon - 23 mon --------- --------- --------10SEP2006 10DEC2006 10OCT2004 In this example, note that the ADD_MONTHS function is applied to SYSDATE, a date data type, and then the result is converted to a character string with TO_CHAR.

Is executed. To undo all column formatting, the command is: CLEAR COLUMNS A problem here may be that CLEAR COLUMNS clears all column formatting, but a universal CLEAR is likely appropriate as the AMOUNT column may well appear in some other table and one might not want the same formatting for both. , greater than 999), then octothorpes (#) would be displayed in the output. A better way to use formatting is to put the format and the statement in a script. /bin directory (Windows) and run with a START command.

07 Scripts Often, a formatting command is used but is meant for only one executable statement. ” is executed. To undo all column formatting, the command is: CLEAR COLUMNS A problem here may be that CLEAR COLUMNS clears all column formatting, but a universal CLEAR is likely appropriate as the AMOUNT column may well appear in some other table and one might not want the same formatting for both. , greater than 999), then octothorpes (#) would be displayed in the output. A better way to use formatting is to put the format and the statement in a script.

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Advanced SQL functions in Oracle 10g by Richard Walsh Earp, Sikha Saha Bagui


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