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Medium 9780596007461

4. A Lightning SQL Tutorial

Jonathan Gennick O'Reilly Media ePub

SQL is the language that you use to manipulate relational data. Other languages for data manipulation do exist, but SQL is the most common, and it's the reason for the "SQL" in "SQL*Plus." Because everything you do in SQL*Plus will involve SQL, it's worth digressing for a chapter to focus on learning the rudiments of the language.

As manifested in Oracle, the SQL language encompasses several categories of statements: statements that work with data, other statements that define and modify the structures (such as tables and indexes) that hold data, and still other statements that control the operation of the database itself.

This chapter focuses on statements used to manipulate data:

Places new records, or rows, into a database table.

Retrieves previously inserted rows from a database table.

Modifies data in a table.

Deletes data from a table.

Brings a table up to date by modifying or inserting rows, as appropriate

The reason I focus on data manipulation in this chapter is that if you're just starting out with SQL, data manipulation is likely to be your first problem. You'll likely be working with tables and other database objects that have been created. Furthermore, data manipulation statements are the ones you'll need to leverage the SQL*Plus reporting capabilities I describe in the next few chapters. Other topics, such as creating database structures (e.g., tables and indexes) and controlling the operation of the database, are database administration topics that rightfully belong in other books.

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Medium 9781780428772

Origins of the Story of Christ

Ernest Renan Parkstone International PDF

Origins of the Story of Christ

A

history of the “Origins of Christianity” touches the obscure and subterranean period where it extends from the first beginnings of this religion to the time when its existence becomes a public, well-known fact, evident to the eyes of all men. Such a history consists of four

books. The first, which I now present to the public, addresses the event that served as the starting-point of the new religion. The second will address the apostles and their immediate disciples, or rather the revolutions in religious thought of the first two Christian generations. I will close it about the year 100, when the last friends of Jesus have died, and all the books of the ‘New Testament have become fixed very nearly in the form in which we read them. The third book will set forth the condition of

Christianity under the Antonines, slowly developing, and maintaining an almost permanent war against the empire, which having now reached the highest degree of administrative perfection and being governed by philosophers, combats in the infant sect of a secret and theocratic society that obstinately denies and incessantly undermines it. This book will comprise the whole of the second century. Finally, the fourth book will show the decisive progress of Christianity from the time of the

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Medium 9780596008857

Updating Data

Jonathan Gennick O'Reilly Media PDF

more than one table. Use the FIRST keyword to limit inserts to only the first matching WHEN clause.

The previous INSERT statement illustrated a conditional multitable insert. Use an unconditional multitable insert to perform each INTO clause you specify. For example:

INSERT ALL

INTO courses_taken (course_name) values (course_name)

INTO students_registered (student_name) values (student_name)

SELECT course_name, student_name

FROM enrollment;

Note that regardless of whether you perform an unconditional or a conditional multitable insert, the target tables for each INTO clause do not need to be the same.

Updating Data

Use the UPDATE statement to modify column values in existing table rows.

Simple Updates

A simple UPDATE statement takes the following form:

UPDATE table_name

SET column_name = new_value, column_name = new_value, column_name = new_value,

...

WHERE selection_criteria;

For example, the following statement corrects a small problem with a course name; it changes the name to use an “I”

(letter) instead of a “1” (digit):

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Medium 9781910444054

CAPÍTULO 1 - El diálogo psicoanalítico

/products/authors/726538/list /products/publishers/16067/list ePub (DRM)

Perecemos con los que agonizan:

Mira cómo se van y partimos con ellos.

Nacemos con los muertos:

Mira cómo vuelven y nos traen con ellos.

—“Cuatro Cuartetos”, T. S. Elliot

Este libro se presenta como un acto de interpretación. Las diferentes perspectivas psicoanalíticas tienen un gran parecido con los diferentes idiomas. A pesar de la extensa superposición de contenido semántico en los textos escritos en diferentes idiomas, cada lengua crea un sentido que no puede ser generado por las otras lenguas que se hablan en la actualidad o que se conservan por escrito. El intérprete no es simplemente un portador pasivo de información de una persona a otra, sino que es el conservador activo y el creador de sentido, y también el recuperador de lo alienado. Como tal, el intérprete salvaguarda la plenitud del discurso humano.

El psicoanálisis, bien como proceso terapéutico, o como conjunto de ideas, se desarrolla como un discurso entre sujetos, en el que cada uno interpreta sus propias producciones y las del otro. Si, por el momento, hablamos del psicoanálisis como teoría (o, más exactamente, como conjunto de teorías), cada contribución importante proporciona un grado de resolución ante un problema teórico o clínico, y al hacerlo de este modo, se crea un nuevo dilema epistemológico. Una contribución posterior ya no aborda la misma cuestión que una contribución anterior, pues ese problema ya no existe, sino que se ha visto alterado para siempre. Cuanto más significativa sea la contribución, más radical (e interesante) habrá sido la transformación del problema epistemológico.

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Medium 9780596527211

E. [2.0] Regular Expressions

Doug Tidwell O'Reilly Media ePub

The regular expression language used by XSLT 2.0, XPath 2.0, and XQuery 1.0 is a superset of the XML Schema regular expression language. Regular expressions are used in the XSLT 2.0 [2.0] <xsl:analyze-string> element and the XPath 2.0 and XQuery 1.0 functions [2.0] matches(), [2.0] replace(), and [2.0] tokenize().

This appendix defines the syntax and capabilities of regular expressions in XSLT 2.0, XPath 2.0, and XQuery 1.0. The details of regular expressions are defined in XQuery 1.0 and XPath 2.0 Functions and Operators section 7.6, String Functions that Use Pattern Matching.

[XPath] The Functions and Operators spec extends the XML Schema regular expression in several ways. Features unique to the XPath 2.0 and XQuery 1.0 regular expression language are indicated with the text [XPath].

The simplest regular expression is just a string of text. The regular expression abc matches the string abc. Were merely searching for a series of characters inside some data. For this case, contains('abc', 'abc') does the same thing.

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