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What are the data types available in JavaScript?

Posted By :Shashi Ray     Posted Date :December 07, 2009    Points :10   Category :.NET Framework 
Object is the only data type available.

You can also find related Interview Question to What are the data types available in JavaScript?  below: 

Can you store multiple data types in System.Array?

  
No, If the System.Array is of Some Particular Data Type.(Primitive Data Type)

yes, If the System.Array is of Object Type.

Ex :

create an array of objects.

int in = 50;
string st = "Fifty";

object [] obj = new object[2];
obj[0] = in;
obj[1] = st; (More...)

What are the data types which are supported as Lookup column in SharePoint.

  
Only Single Line of Text and Calculated columns are supported as lookup columns. (More...)

What's the difference between NCHAR and NVARCHAR data types and ?

  
NCHAR and NVARCHAR data types are both Unicode character data types with a maximum length of 4,000 characters. The main difference between these 2 data types is that an NCHAR data type is fixed-length while an NVARCHAR is variable-length. If the number of characters entered in an NCHAR data type column is less than the specified column length, spaces are appended to it to fill up the whole length.

Another difference is in the storage size wherein the storage size for NCHAR is two times n bytes while for NVARCHAR is two times the number of characters entered (in bytes).

You should use NCHAR data type when the data values in a column are expected to be consistently close to the same size. On the other hand, you should use NVARCHAR when the data values in a column are expected to vary considerably in size.
(More...)

What's the difference between CHAR and VARCHAR data types ?

  
CHAR and VARCHAR data types are both non-Unicode character data types with a maximum length of 8,000 characters. The main difference between these 2 data types is that a CHAR data type is fixed-length while a VARCHAR is variable-length. If the number of characters entered in a CHAR data type column is less than the declared column length, spaces are appended to it to fill up the whole length.

Another difference is in the storage size wherein the storage size for CHAR is n bytes while for VARCHAR is the actual length in bytes of the data entered (and not n bytes).

You should use CHAR data type when the data values in a column are expected to be consistently close to the same size. On the other hand, you should use VARCHAR when the data values in a column are expected to vary considerably in size.
(More...)

What's the difference between SMALLDATETIME and DATETIME data types ?

  
A datetime data type is date and time data from January 1, 1753 through December 31, 9999, to an accuracy of one three-hundredth of a second (equivalent to 3.33 milliseconds or 0.00333 seconds). Values are rounded to increments of .000, .003, or .007 seconds.

On the other hand, a smalldatetime data type is a date and time data from January 1, 1900, through June 6, 2079, with accuracy to the minute. smalldatetime values with 29.998 seconds or lower are rounded down to the nearest minute; values with 29.999 seconds or higher are rounded up to the nearest minute.

Values with the datetime data type are stored internally by Microsoft SQL Server as two 4-byte integers. The first 4 bytes store the number of days before or after the base date, January 1, 1900. The base date is the system reference date. Values for datetime earlier than January 1, 1753, are not permitted. The other 4 bytes store the time of day represented as the number of milliseconds after midnight.

The smalldatetime data type stores dates and times of day with less precision than datetime. SQL Server stores smalldatetime values as two 2-byte integers. The first 2 bytes store the number of days after January 1, 1900. The other 2 bytes store the number of minutes since midnight. Dates range from January 1, 1900, through June 6, 2079, with accuracy to the minute.

smalldatetime is usually used when you don't need to store the time of the day such as in cases of effectivity dates and expiration dates. datetime is used if the time of the day is needed and up to the second accuracy is required.
(More...)

What are the types of Data compression?

  
There are two types of data compression
-Row compression
-Page Compression (More...)

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