. . . . . . . . . . . . . . . . . . . . . . . . 38 13.1. NULL <=> non-NULL conversions you didn’t ask for . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 13.2. Descriptors difficult to grasp — perhaps partly because of the name, which suggests a kind of “nothing” that won’t do any harm if you add it to a number or stick it to the back of a string. In reality, performing such of these values. Few things in SQL lead to more confusion than NULL, and yet its workings shouldn’t be hard to understand as long as you stick to the following simple definition: NULL means unknown.

словом. CREATE TABLE T (ABS INT NOT NULL); При выполнении такого оператора будет выдана ошибка потому, что ADD является ключевым и зарезервированным словом. CREATE TABLE T (ADD INT NOT NULL); L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z ::= a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p | q | r | s | t | u | v | w | x | y | z ::= целочисленные — 0, -34, 45, 0X080000000; • вещественные — 0.0, -3.14, 3.23e-23; • строковые — 'текст', 'don''t!'; • дата — DATE '10.01.2014'; • время — TIME '15:12:56'; • временная отметка — TIMESTAMP '10.01.2014

the uninstall scripts should have removed any copies and/or symlinks in /usr/lib[64], but it won’t hurt to look if anything named libfbclient.* or libgds.* is still lying around. Chapter 3. Installing Firebird 5 can open Firebird 4 databases, and even upgrade them, from ODS 13.0 to ODS 13.1, but won’t open databases that were created by Firebird 3 or older. So, before taking down your existing setup mapped drive, a filesystem share or a network filesystem. (Well, you can, but you shouldn’t, and this technique isn’t covered here.)  You can open a read-only database from a read-only medium like a DVD

configuration file firebird.conf. Guardian When run as a Windows application (as opposed to a service) you can't use the Fire- bird Guardian. Note that running Firebird as an application is the only option on Win- be used with the Guardian on Win- dows, whether run as an application or as a service. Events Can't use Fiebird events if the server is be- hind a firewall or if connections are made through a secure can see, neither of the architectures is better in all respects. This is hardly surprising: we wouldn't maintain two separate architectures if one of them was an all-fronts loser. If you're still not sure

reserved word. CREATE TABLE T (ABS INT NOT NULL); On the contrary, the following statement will return an error because ADD is both a keyword and a reserved word. CREATE TABLE T (ADD INT NOT NULL); Refer N | O | P | Q | R | S | T | U | V | W | X | Y | Z ::= a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p | q | r | s | t | u | v | w | x | y | z 0X080000000; fixed-point - 0.0, -3.14 floating-point - 3.23e-23; string - 'text', 'don''t!'; binary string - x'48656C6C6F20776F726C64' date - DATE '2018-01-19'; time - TIME

für SQL in Bezug auf Datentypen, Datenspeicherstrukturen, Mechanismen zur referentiellen Integrität sowie Fähigkeiten zur Datenmanipulation und Zugriffsrechte. Firebird beinhaltet außerdem eine Drei Dialekte stehen zur Verfügung: • Dialekt 1 dient ausschließlich dazu, die Abwärtskompatibilität mit Legacy-Datenbanken aus sehr alten InterBase-Versionen, v.5 und darunter, zu ermöglichen. Dialekt 19 CREATE TABLE T (ABS INT NOT NULL); Im Gegenteil, die folgende Anweisung gibt einen Fehler zurück, da ADD sowohl ein Schlüsselwort als auch ein reserviertes Wort ist. CREATE TABLE T (ADD INT NOT NULL);

reserved word. CREATE TABLE T (ABS INT NOT NULL); On the contrary, the following statement will return an error because ADD is both a keyword and a reserved word. CREATE TABLE T (ADD INT NOT NULL); Refer N | O | P | Q | R | S | T | U | V | W | X | Y | Z ::= a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p | q | r | s | t | u | v | w | x | y | z - 0, -34, 45, 0X080000000; real - 0.0, -3.14, 3.23e-23; string - 'text', 'don''t!'; binary string - x'48656C6C6F20776F726C64' date - DATE'2018-01-19'; time - TIME'15:12:56';

............................................................................................... 3 Tópicos discutidos neste documento .................................................................. pré-requisitos, então leia o primeiro o Howto Gerando as manuais Firebird e depois volte a ler este texto. Tópicos discutidos neste documento Começaremos com alguns capítulos curtos sobre: • A lista de discussão DocBook XML, porque este é o formato em que desejamos que você nos entregue os seu(s) documento(s). Os tópicos discutidos incluem: • O que é o DocBook XML • Razões para a nossa forte preferência ao DocBook

était à l'origine le Chapitre 1 du manuel Using Firebird, vendu sur CD par IBPhoenix. Plus tard, il a été publié séparément sur Internet. En Juin 2004, IBPhoenix a donné ce guide au projet Firebird. Important Implémentation partielle de Ser- vices Manager, les tâches comme sauve- garde/restauration, arrêt de base etc. sont pos- sible à travers le réseau. Les autres tâches de service doivent être faites à l'aide d'outils Services Manager complets ( Windows et Linux) vous per- met d'effectuer des tâches de maintenance (sauvegarde/restau- ration, arrêt de base, gestion des utilisateurs, statistiques, etc.) par programmation

same column in an INSERT or UPDATE statement. Thus, a statement like INSERT INTO T(A, B, A) ... or UPDATE T SET A = x, B = y, A = z will be rejected in Firebird 2.n, even though it was validated more strictly than they were formerly. If you encounter an exception related to plans, e.g. Table T is not referenced in plan, it will be necessary to inspect your procedure and trigger sources and adjust Compatibility Issues 8 This means that, now, SELECT T1.*, T2.COL FROM T1, T2 ORDER BY 2 sorts on the second column of table T1, while the previous versions sorted on T2.COL. Tip This change makes it possible