данных pubs. */ CREATE PROCEDURE list_states AS SELECT Переход с MS SQL на Firebird 14 CASE state WHEN 'CA' THEN 'California' WHEN 'UT' THEN 'Utah' ELSE 'unknown' END FROM authors PROCEDURE get_state_name ( state_code char(2) ) RETURNS ( state_name varchar(64) ) AS BEGIN IF (state_code = 'CA') THEN state_name = 'California'; ELSE IF (state_code = 'UT') THEN state_name = 'Utah'; 'Utah'; ELSE state_name = 'unknown'; END /* Это процедура-выборка. */ CREATE PROCEDURE list_states RETURNS (state varchar(64)) AS DECLARE VARIABLE short_state CHAR(2); BEGIN FOR SELECT state FROM authors

DATE'2018-01-19'; time - TIME'15:12:56'; timestamp - TIMESTAMP'2018-01-19 13:32:02'; null state - null Details about handling the literals for each data type are discussed in the next chapter Types “Special” data types … 3.7.1. SQL_NULL Data Type The SQL_NULL type holds no data, but only a state: NULL or NOT NULL. It is not available as a data type for declaring table fields, PSQL variables < 18 THEN 'No' ELSE 'Unsure' END 4.1.4. NULL in Expressions NULL is not a value in SQL, but a state indicating that the value of the element either is unknown or it does not exist. It is not a zero

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 632 14.6. Reset Session State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . '15:12:56'; timestamp - TIMESTAMP '2018-01-19 13:32:02'; boolean - true, false, unknown null state - null Details about literals for each data type are discussed in section Literals (Constants) Types “Special” data types … 3.9.1. SQL_NULL Data Type The SQL_NULL type holds no data, but only a state: NULL or NOT NULL. It is not available as a data type for declaring table fields, PSQL variables

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1. NULL as a default state. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . to the summary at the end of the guide. So — what is it? In SQL, NULL is not a value. It is a state indicating that an item’s value is unknown or nonexistent. It is not zero or blank or an “empty string” IBPhoenix, now part of the Firebird Project. 1.1. NULL as a default state Because NULL means “value unknown”, it is the logical default state for any field or variable that has been created but not provided

which failed due to a lost connection. If a failed transaction is rolled back in either manner, its state is set to committed as there are no differences between a failed transaction and one in which it above, but a new state has been added to define exactly how the database is to be stopped or started. The commands change from those described above to the following: gfix -sh[utdown] STATE OPTION TIMEOUT TIMEOUT database_name gfix -o[nline] STATE database_name STATE is new in Firebird 2.0 and is one of the following: normal This is the default state for starting the database backup. It allows connections

Datenbankdatei wird geöffnet; 2. In dieser Datei wird das Zustandsflag von gesperrt (nbak_state_stalled) auf normal (nbak_state_normal) geändert; 3. Die Datei wird wieder geschlossen.  nbackup -F arbeitet gibt es drei Statusänderungen: 1. nbak_state_normal (kein Backup) zu nbak_state_stalled (Datenbank schreibt in Delta-Datei) 2. nbak_state_stalled zu nbak_state_merge (Zusammenführen der Delta-Datei zurück zurück in die Datenbank) 3. nbak_state_merge zu nbak_state_normal (kein Backup)  Diese drei Statusänderungen treten auch dann auf, wenn die Sicherung fehlschlägt. Der SCN der Datenbank vor dem Start

(обычно подзапросы являются коррелированными). Примеры SELECT id, name, sex, age FROM actors WHERE state = 'Ohio' SELECT * FROM birds WHERE type = 'flightless' ORDER BY family, genus, species SELECT GDS_CODE, SQL_CODE, SQL_STATE) VALUES ('ADD_COUNTRY', GDSCODE, SQLCODE, SQLSTATE); GDS_CODE, SQL_CODE, SQL_STATE) VALUES ('ADD_COUNTRY', GDSCODE, SQLCODE, SQLSTATE);

be restored to a state consistent with those rules. If a transaction successfully executes, it will take the database from one state that is consistent with the rules to another state that is also consistent from one another, even if several transactions are running concurrently. Concurrency refers to a state within the database where two or more tasks are running simultaneously. This way, a transaction’s error. Executing this command, without passing a parameter, results in a toggling of the current state. If bail is on, it will turn off and vice versa. Chapter 18. Isql Set Commands 40 18.4. SET BLOBdisplay

'2018-01-19 13:32:02'; boolean - true, false, unknown Chapter 2. SQL Sprachstruktur 21 null state - null Details zum Umgang mit den Literalen für jeden Datentyp werden im nächsten Kapitel Datentypen THEN 'No' ELSE 'Unsure' END 4.1.4. NULL in Ausdrücken NULL ist in SQL kein Wert, sondern ein state, der anzeigt, dass der Wert des Elements entweder unbekannt ist oder nicht existiert. Es ist weder oder mehrere Ereignisse. Phase Phase betrifft das Timing des Triggers in Bezug auf das Change-of-State-Ereignis in der Datenzeile: • Ein BEFORE-Trigger wird ausgelöst, bevor die angegebene Datenbankoperation

but changes are being merged from the diff file into the main pages. 0xC00 The current database state is unknown and changes need to be read from disk. hdr_shutdown_mask The shutdown mask uses two Nullable MON$STAT_ID (RDB$STAT_ID) INTEGER Nullable MON$BACKUP_STATE (RDB$BACKUP_STATE) SMALLINT Nullable SQL> commit; SQL> quit; hdr_data The variable data area on this, the decompression code is easily able to convert the stored data back to the uncompressed state. The following section shows a worked example of an examination of a table and some test data. 8