. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 528 10.6.6. ROW_NUMBER(). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 547 11.17. ROW_COUNT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CUSTOMER VARCHAR(25) NOT NULL, CONTACT_FIRST VARCHAR(15), CONTACT_LAST VARCHAR(20), ... PRIMARY KEY (CUST_NO) ) 3.1.3. BIGINT BIGINT is an SQL:99-compliant 64-bit integer data type, available only

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 378 9.14. ROW_COUNT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Types and Subtypes 25 CONTACT_FIRST VARCHAR(15), CONTACT_LAST VARCHAR(20), ... PRIMARY KEY (CUST_NO) ) 3.1.3. BIGINT BIGINT is an SQL:99-compliant 64-bit integer data type, available only Elements. Examples Using Integer Types CREATE TABLE WHOLELOTTARECORDS ( ID BIGINT NOT NULL PRIMARY KEY, DESCRIPTION VARCHAR(32) ); INSERT INTO MYBIGINTS VALUES ( -236453287458723, 328832607832,

(PRIMARY KEY) ............................................................... 118 Ограничение уникальности (UNIQUE) ........................................................ 118 Внешний ключ (FOREIGN KEY) . ............................................................................................ 399 ROW_COUNT ............................................................................................ ............................................................................................. 484 ROW_NUMBER ...........................................................................................

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 Primary key with NULL entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Please realise that an index may be active even if it has not been created explicitly, namely if a key is defined on A. Example: Table TA has a column A with values { 3, 8 }. Table TB has a column B containing procedure and trigger language). 5.3.1. EXISTS EXISTS tells you whether a subquery returns at least one row of data. Suppose you want a list of farmers who are also landowners. You could get one like this:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 484 10.4.3. ROW_NUMBER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 502 11.16. ROW_COUNT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CUSTOMER VARCHAR(25) NOT NULL, CONTACT_FIRST VARCHAR(15), CONTACT_LAST VARCHAR(20), ... PRIMARY KEY (CUST_NO) ) 3.1.3. BIGINT BIGINT ist ein SQL:99-kompatibler 64-Bit-Integer-Datentyp, der nur in Dialect

CURRENT_TIMESTAMP CURRENT_TRANSACTION CURRENT_USER DELETING GDSCODE INSERTING NEW 'NOW' OLD ROW_COUNT SQLCODE SQLSTATE UPDATING 12. Операторы и предикаты Разрешено использование NULL как операнда ENTRY_POINT, EXCEPTION, EXIT, FILE, GEN_ID, GENERATOR, IF, INACTIVE, INPUT_TYPE, ISOLATION, KEY, LENGTH, LEVEL, MANUAL, MODULE_NAME, NAMES, OPTION, OUTPUT_TYPE, OVERFLOW, PAGE, PAGE_SIZE, PAGES AUTODDL, BASE_NAME, BASED, BLOBEDIT, BUFFER, CHECK_POINT_LENGTH, COMPILETIME, CONTINUE, DB_KEY, DEBUG, DESCRIBE, DISPLAY, ECHO, EDIT, EVENT, EXTERN, FOUND, GOTO, GROUP_COMMIT_, HELP, IMMEDIATE

4. Using generators to create unique row IDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1. Why row IDs at all? . . . . . . . . . . . . . create unique row IDs 4.1. Why row IDs at all? The answer to this question would go far beyond the scope of this article. If you see no need to have a generic, unique “handle” for every row inside a table general, you should probably skip this section… 4.2. One for all or one for each? OK, so you want row IDs. { author’s note: congratulations! :-) } A major, basic decision to take is whether we’ll use

you for each column’s data and adds a row to the table. You may add as many rows as you wish as the command continues until either an error occurs, or the Enter key is pressed with no data. If you wish Primary key constraint, if there is one. ◦ The index used to support the primary key constraint, if there is one. • Not all of the table structure is actually copied. Missing are: ◦ Foreign Key constraints constraints. ◦ Check constraints. ◦ Indices other than the primary key index. ◦ Triggers. ◦ All of the table’s data. If you wish to copy to a different database, then the other database must be on the

colwidth="1*"/> <row> Database Votes Percentage row> Firebird Docwriting-Anleitung 26 <row> Total 1111 99.99 row> <row> MySQL 405 36.45 row> <row> Firebird 403 36.27 row> ... 5 more rows not shown here ..

leaves around in the database after a rollback has been carried out. This is basically a copy of the row(s) from the table(s) that were being updated (or deleted) by the transaction prior to the rollback a page that needs cleaning. Because Firebird uses multi-generational architecture, every time a row is updated or deleted, Firebird keeps a copy in the database. These copies use space in the pages gbak tool. Gbak reads every table sequentially and thus visits every row in every table. Applications which also visit every row in one or more tables, will also cause the garbage in those tables to