![]() The time component is stored in the second 4-byte (or 2-byte for SMALLDATETIME) field as the number of three-hundredths of a second (DATETIME) or minutes (SMALLDATETIME) that have passed since midnight. The analog value of SMALLDATETIME is stored in the range to. The date value of DATETIME is stored in the range to. Values of DATETIME and SMALLDATETIME are stored internally as two separate numeric values. The DATETIME and SMALLDATETIME data types specify a date and time, with each value being stored as an integer value in 4 bytes or 2 bytes, respectively. The maximum number of characters in a column of the NVARCHAR data type is 4000. The main difference between the VARCHAR and the NVARCHAR data types is that each NVARCHAR character is stored in 2 bytes, while each VARCHAR character uses 1 byte of storage space. Stores variable-length strings of Unicode characters. Therefore, the maximum number of characters in a column of the NCHAR data type is 4000. The main difference between the CHAR and NCHAR data types is that each character of the NCHAR data type is stored in 2 bytes, while each character of the CHAR data type uses 1 byte of storage space. Stores fixed-length strings of Unicode characters. This data type has two synonyms: CHAR VARYING and CHARACTER VARYING. In contrast to the CHAR data type, the values for the VARCHAR data type are stored in their actual length. If n is omitted, the length of the string is assumed to be 1.ĭescribes a variable-length string of single-byte characters (0 < n ≤ 8000). CHARACTER(n) is an additional equivalent form for CHAR(n). Represents a fixed-length string of single-byte characters, where n is the number of characters inside the string. The following character data types are used: Data Type (Unicode uses several bytes to specify one character.) Further, strings can have fixed or variable length. ![]() They can be strings of single-byte characters or strings of Unicode characters. There are two general forms of character data types. MONEY values correspond to 8-byte DECIMAL values and are rounded to four digits after the decimal point.Ĭorresponds to the data type MONEY but is stored in 4 bytes. p defines the precision, with p = 25 as double precision (stored in 8 bytes). Represents floating point values, like REAL. The range of positive values is approximately 2.23E – 308 to 1.79E + 308, and the range of negative values is approximately –1.18E – 38 to –1.18E + 38 (the value zero can also be stored). DECIMAL values are stored, depending on the value of p, in 5 to 17 bytes. The argument p (precision) specifies the total number of digits with assumed decimal point s (scale) digits from the right. The range of values is –263 to 263 – 1.ĭescribes fixed-point values. Represents integer values that can be stored in 8 bytes. Represents nonnegative integer values that can be stored in 1 byte. Represents integer values that can be stored in 2 bytes. Represents integer values that can be stored in 4 bytes. The following table shows the list of all numeric data types: Data Type ![]() Numeric data types are used to represent numbers. The following sections describe all these categories. (The only exception specifies the values of the SQL_VARIANT data type.) Transact-SQL uses different data types, which can be categorized as follows: All the data values of a column must be of the same data type.
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