使用类的DataType一个静态成员,例如Int。这实际上将返回对象的DataType实例。 DataType对象具有定义数据类型的几个属性。 例如,该SqlDataType属性指定 SQL Server 数据类型。 表示 SQL Server 数据类型的常量值列在SqlDataType枚举中。 这是指诸如varchar、nchar、currency、integer、float和datetime这样的数据类型。
SQL Server does not automatically promote other integer data types (tinyint, smallint, and int) to bigint.Upozornění When you use the +, -, *, /, or % arithmetic operators to perform implicit or explicit conversion of int, smallint, tinyint, or bigint constant values to the floa...
例如,在下列代码中, $changeDate、 $rate和$payFrequency 分别指定为 $params数组中的 SQL Server 类型 datetime、 money 和tinyint。 因为没有为 $employeeId 指定任何 SQL Server 类型,并且该类型初始化为一个整数,所以将使用默认的 SQL Server 类型 integer。 复制 $employeeId = 5; $changeDa...
SQL Data Types define the type of value that can be stored in a table column. For example, if we want a column to store only integer values, then we can define it’s data type asint. SQL数据类型定义可以存储在表列中的值的类型。 例如,如果我们希望一列仅存储整数值,则可以将其数据类型定义...
SQL Server 2012 引入了TRY_CONVERT函数,用于尝试将给定的表达式转换为指定的数据类型。如果转换成功,则返回转换后的值;否则,返回 NULL。 下面是一个示例,展示了如何使用TRY_CONVERT函数来判断数据的类型: SELECTcolumn_name,CASEWHENTRY_CONVERT(INT,column_name)ISNOTNULLTHEN'Integer'WHENTRY_CONVERT(DATETIME,column...
Numeric Data Types Data typeDescriptionStorage bitInteger that can be 0, 1, or NULL tinyintAllows whole numbers from 0 to 2551 byte smallintAllows whole numbers between -32,768 and 32,7672 bytes intAllows whole numbers between -2,147,483,648 and 2,147,483,6474 bytes ...
Conversion support for this type was provided by the SQL Server Compact 3.5 SP1 release. geometry image Conversion support for this type was provided by the SQL Server Compact 3.5 SP1 release. image image integer(synonym: int) integer money ...
SQL database in Microsoft Fabric In the SQL Server Database Engine, each column, local variable, expression, and parameter has a related data type. A data type is an attribute that specifies the type of data that the object can hold: integer data, character data, monetary data, date and ...
By using the UNSIGNED attribute, you can have that range start at zero rather than a negative integer. MySQL Data Types - Date/Time Types DATE() : YYYY-MM-DD is the standard format. Note that the range supported is '1000-01-01' to '9999-12-31'. DATETIME(): The combination of a...
-- Defining a column named "col3" of the INTEGER data type col3 INTEGER, -- Defining a column named "col4" of the BIGINT data type col4 BIGINT, -- Defining a column named "col5" of the FLOAT data type with at least 2 digits after the decimal point ...