A NULL value takes up one byte of storage and indicates that a value is not present as opposed to a space or zero value. It's the DB2 equivalent of TBD on an organizational chart and often correctly
Latest Answer : A NULL value is different from a blank or a zeroA NULL value can be inserted into columns of any data typeA NULL value will evaluate to NULL in any expression (e.g.NULL multiplied by 10 is NULL)If a column has a NULL value, Oracle ignores any UNIQUE, ...
?a.Check if equal to NULLb.Use null indicator, 0 indicates nullc.Use null indicator, -1 indicates nulld.Use null indicator, -2 indicates nulle.None of the above.Use null indicator, -1 indicates null
Target table T1 is getting deleted. Table T2 has the foreign key. We require that whenever a row from T1 is deleted, the corresponding row from T2 also be deleted. Which option can be used? a.ON DELETE
