(极少使用) 3.Datetime and Interval Data Types时间类型 3.1.DATE 有效日期范围从公元前4712年1月1日到公元9999年12月31日。 默认格式由NLS_DATE_FORMAT参数显式确定,或由NLS_TERRITORY参数隐式确定。 大小固定为7个字节。 此数据类型包含日期时间字段YEAR,MONTH,DAY,HOUR,MINUTE和SECOND。 它没有小数秒或时区。
Oracle provides you with two date-time data types:DATEandTIMESTAMPfor storing point-in-time data. In addition, It provides theINTERVALdata type that allows you to store periods of time. There are two types ofINTERVAL: INTERVAL YEAR TO MONTH– stores intervals using year and month. INTERVAL D...
1、字符串类型。如:char、nchar、varchar2、nvarchar2。 2、数值类型。如:int、number(p,s)、integer、smallint。 3、日期类型。如:date、interval、timestamp。 4、PL/SQL类型。如:pls_integer、binary_integer、binary_double(10g)、binary_float(10g)、boolean。plsql类型是不能在sql环境中使用的,比如建表时。
The .NET Framework Data Provider for Oracle does not always make it easy to retrieve data stored in complex ways. This article discusses how to access data stored in the Oracle-specific data types listed in the following table: Expand table TheSystem.Data.OracleClientnamespace contains types use...
An interval data type must be specified for a datetime arithmetic result 日時減算に対して時間隔型へのキャストが指定されませんでした。この型はコンテキストから推測できません。 2790 Cannot infer type of case expression from its use 結果のすべての式はCAST演算子...
static int DATETIME_OR_INTERVAL_CATEGORY A constant that represents a category of DATE, TIMESTAMP, and INTERVAL data types. static DataType DECIMAL A constant that represents the DECIMAL data type. static DataType DS_INTERVAL A constant that represents an INTERVAL DAY TO SECOND data type. static...
Oracle Database provides a number of built-in data types as well as several categories for user-defined types that can be used as data types. The syntax of Oracle data types appears in the diagrams that follow. The text of this section is divided into the following sections: ...
As of Oracle9i Release 2, Oracle also supports two INTERVAL datatypes, INTERVAL YEAR TO MONTH and INTERVAL DAY TO SECOND, which are used for storing a specific amount of time. This data can be used for date arithmetic. Temporal validity Oracle Database 12c introduced a new concept related to...
Store unicode character data encoded by NLS_NCHAR_CHARACTERSET MAX_STRING_SIZE STANDARD 4000 bytes EXTENDED 32767 bytes For aUnicode Standard-enabled database(NLS_CHARACTERSET is set to AL32UTF8), we can also use datatype VarChar2 to store unicode character data.NVarChar isNOTthe preferred option...
(For more background about TIMESTAMP and INTERVAL types, read Jonathan Gennick's Oracle Magazine articles "Datetime Datatypes Add Precision" and "Finding the Time in Between" (both published in the Nov.-Dec. 2002 issue).How Oracle Stores DATEs. The first thing to grasp about the DATE type ...