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yes, a null session is enabled by default in 95 after 30-60 min
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What is meant by a mandatory field?
a mandatory field in a database is one created in a table as "Not null". This means, there is a "rule" on the field that when data is inserted into the table, this field cannot be empty. If it is, then the insert errors. Here's part of a table definition in my database. These field are are required to be populated when inserting into this table. ATTR_DESC_01 CHAR(2) DEFAULT SYSTEM NOT NULL, ATTR_DESC_02 CHAR(2) DEFAULT SYSTEM NOT NULL, ATTR_DESC_03 CHAR(2) DEFAULT SYSTEM NOT NULL, ATTR_DESC_04 CHAR(2) DEFAULT SYSTEM NOT NULL, ATTR_DESC_05 CHAR(2) DEFAULT SYSTEM NOT NULL, ATTR_DESC_06 CHAR(2) DEFAULT SYSTEM NOT NULL, ATTR_DESC_07 CHAR(2) DEFAULT SYSTEM NOT NULL, ATTR_DESC_08 CHAR(2) DEFAULT SYSTEM NOT NULL, ATTR_DESC_09 CHAR(2) DEFAULT SYSTEM NOT NULL, ATTR_DESC_10 CHAR(2) DEFAULT SYSTEM NOT NULL, PARTITION_NBR SMALLINT NO DEFAULT NOT NULL)
How does select operation perform in RDBMS?
Data is contained in tables. Tables have fields (columns) that hold rows of data. Here is an example of the field in a table: >>invoke $d001.vssdata.lastactv;-- Definition of table \BEAST.$D001.VSSDATA.LASTACTV-- Definition current at 15:46:25 - 06/25/07(STYLE_NBR INT NO DEFAULT NOT NULL, ITEM_NBR INT NO DEFAULT NOT NULL, SHOP_NBR SMALLINT NO DEFAULT NOT NULL, COLOR_NBR SMALLINT NO DEFAULT NOT NULL, SIZE_NBR SMALLINT NO DEFAULT NOT NULL, LAST_ACTIVITY_DATE DATETIME YEAR TO DAY NO DEFAULT NOT NULL, REGULAR_EOP_STOCK_UNITS INT NO DEFAULT NOT NULL, REGULAR_EOP_STOCK_RETAIL NUMERIC( 18, 2) NO DEFAULT NOT NULL, REGULAR_EOP_STOCK_COST NUMERIC( 18, 2) NO DEFAULT NOT NULL, REDLINE_EOP_STOCK_UNITS INT NO DEFAULT NOT NULL, REDLINE_EOP_STOCK_RETAIL NUMERIC( 18, 2) NO DEFAULT NOT NULL, REDLINE_EOP_STOCK_COST NUMERIC( 18, 2) NO DEFAULT NOT NULL, MODEL_INVENTORY INT NO DEFAULT NOT NULL, PCT_STK_NUMERATOR SMALLINT NO DEFAULT NOT NULL, PCT_STK_DENOMINATOR SMALLINT NO DEFAULT NOT NULL, LOAD_STYLE INT NO DEFAULT NOT NULL, INTRANSIT_UNITS INT NO DEFAULT NOT NULL, OWNER_NBR SMALLINT NO DEFAULT NOT NULL)>>CODE EOF LAST MODIFIED OWNER RWEP PExt SE Say you wanted to know the stock cost between May 1 and May 31. You would query that table for that data. select style_number, regular_eop_stock_cost, owner_nbr from $data.vssdata.lastactv where last_activity_date between "05-01-07" and "05-31-07"; Depending on how large the table is, how fragmented, and last update stats, it could return the data quickly or it could take an hour or more. The date format in the query depends on the database.
What is the default value of a reference?
null
How do you bring up a HTML document for a Windows Vista?
From a C-program?ShellExecute (NULL, "open", "C:\DIR\INDEX.HTML", NULL, NULL, SW_SHOW);
Default value for instance variable?
Depending on the language you are using the default of an instance variable can be '0', 0, null, empty, '', or have a random number.
What is the by default value of globally declaration variable?
int, float: 0 pointer: NULL
What are the various cases where use of a NULL value would be appropriate?
Optional data fields: NULL can be used to indicate that certain fields in a database can have no value assigned to them. Unknown data: NULL can be used to represent missing or unknown information. Default values: NULL can be used as a default value for a field until a proper value is provided. Uninitialized variables: In programming, NULL can be used to indicate that a variable has not been assigned a value yet.
How do you Avoid missing column values for non primary key columns?
Use Default and Not NULL
In writing a paper what is the meaning of a null hypothesis?
The meaning of a null hypothesis when writing a paper is to produce a default or general position, in which case there is no relationship between the two phenomena to be measured.
What value is assigned to extern variable?
Default initial value of extern integral type variable is zero otherwise null.
How do you set the null value in array?
Depends on the programming language, some languages may have already initialize an array with null (or the default value of the type), some of them require explicitly assignments by stepping through each element of that array, and assigning them with null. (imperative languages)
What is the default initial value for all numeric types?
If they are instance variables the default initial value is 0. If they are method local variables, they are null and must be initialized to some value before they are used
