. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 3.9.1. SQL_NULL Data Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 4.1.4. NULL in Expressions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 to the list of

li, null=True, on_delete='SET NULL') pcp = CharField(null=True) tmp = CharField(null=True) slr = CharField(null=True) hmd = CharField(null=True) wnd = CharField(null=True) wnd_dir = CharField(null=True) CharField(null=True) lat = DoubleField(null=True) lon = DoubleField(null=True) weather_sta_cli PK id int name text FK wgn_id int REFERENCES weather_wgn_cli (id) ON DELETE SET NULL pcp text null tmp text text null slr text null hmd text null wnd text null wnd_dir text null atmo_dep text null lat real null lon real null Wind_dir_cli 2.4. Database Documentation 15 SWAT+ Editor Documentation Note:

of the left table. When outputting a left-table row for which there is no right-table match, empty (null) values are substituted for the right-table columns. Exercise: There are also right outer joins real, elevation int -- (in ft) ); CREATE TABLE capitals ( state char(2) UNIQUE NOT NULL ) INHERITS (cities); In this case, a row of capitals inherits all columns (name, population, and ................................................................................... 65 5.4.2. Not-Null Constraints ................................................................................. 68 5

....................................................................................51 5.3.2. Not-Null Constraints....................................................................................53 Mapping................................................................................1132 43.3.2. Null, None............................................................................................ Configuration.............................................................................2251 F.25.6.2. NULL Handling ........................................................................2252 F.25.6.3. Security

.............................................................................. 20 Expresiones con NULL ................................................................................................. varchar (32 KB). Vea también en las notas más abajo, Expresiones con NULL, sobre la concatenación de expresiones que invo- lucran NULL. División de un entero por un entero Firebird respeta el estándar / 3 = 0.333 Expresiones con NULL En SQL, NULL no es un valor. Es una condición, o estado, de un dato, en el cual su valor es desconocido. Debido a que es desconocido, NULL no puede comportarse como un

Enter key is pressed with no data. If you wish to set a column to NULL, type it in exactly as shown. SQL> add country; Enter data or NULL for each column. RETURN to end. Enter COUNTRY>Scotland Enter CURRENCY>GBP (EMPNO) SMALLINT Not Null FIRST_NAME (FIRSTNAME) VARCHAR(15) Not Null LAST_NAME (LASTNAME) VARCHAR(20) Not Null PHONE_EXT VARCHAR(4) VARCHAR(4) Nullable HIRE_DATE TIMESTAMP Not Null DEFAULT 'NOW' DEPT_NO (DEPTNO) CHAR(3) Not Null CHECK (VALUE = '000' OR

Hardware { // Contain the last event we got from the listener static public SensorEvent lastEvent = null; // Define a new listener static class AccelListener implements SensorEventListener { public void SENSOR_ ˓→SERVICE); Sensor accel = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); if (accel == null) return; if (enable) sm.registerListener(accelListener, accel, SensorManager.SENSOR_DELAY_ ˓→GAME);

of the left table. When outputting a left-table row for which there is no right-table match, empty (null) values are substituted for the right-table columns. Exercise: There are also right outer joins and int4 (See integer) int8 (See bigint) integer, ? internal, ? intersection, ? interval, ? IRIX, ? IS NULL, ? isolation levels, ? read committed, ? read serializable, ? J join, 9 outer, ? self, ? joins