BINARY_DOUBLEA 64-bit, double-precision floating-point number data type. Each BINARY_DOUBLE value requires 8 bytes. Supports the special values infinity and NaN (not a number).Magnitude: 2.22507485850720E-308 … 1.79769313486231E+308 BOOLEANTrue, False or NULLn/a ...
System.Data.OracleClient OracleBFile OracleBinary OracleBoolean OracleClientFactory OracleCommand OracleCommandBuilder OracleConnection OracleConnectionStringBuilder OracleDataAdapter OracleDataReader OracleDateTime OracleException OracleInfoMessageEventArgs OracleInfoMessageEventHandler ...
0)Oracle data type to theboolEDM type. For example,Number(1,0), which is mapped toInt16by default, can be custom mapped to the .NETBoolor .NETBytetype. This example mapsNumber(3,0)tobyte, and sets the maximum precisions for theInt16, Int32,andInt64data types to 4, 9, and 18 ...
1.3.2.6 布尔类型(BOOLEAN) 布尔类型能存储逻辑值TRUE、FALSE和NULL(NULL代表缺失、未知或不可用的值)。只有逻辑操作符才允许应用在布尔变量上。 数据库SQL类型并不支持布尔类型,只有PL/SQL才支持。所以就不能往数据库中插入或从数据库中检索出布尔类型的值。 1.3.2.7 Datetime和Interval类型 Datetime就是日期时间...
the Oracle SQL DECODE construct. PL/SQL, on the other hand, has a few tricks up its sleeve that are unavailable in native SQL. One particularly pleasant example of this is the BOOLEAN datatype.[15]Boolean data may only be TRUE, FALSE, or NULL. A Boolean is a “logical” datatype. ...
eg; create table obj_emp of emp_type; 2.列对象(包含多个列) eg; create table obj_emp( dno number,dname varchar2(10), emp emp_type ); 《2》对象类型继承 《3》引用对象类型 ref(指向对象的逻辑指针,是oracle的一种内置数据类型)(通过引用可以使不同表共享相同对象,从而降低内存占用) ...
The search condition must evaluate to a Boolean expression and cannot contain subqueries. A column-level CHECK constraint can reference only the constrained column, and a table-level check constraint can reference only columns of the constrained table. Multiple CHECK constraints can be defined for a...
BOOLEAN ドキュメントにトークンが含まれていない場合は、NULLを戻すか、または戻されるXMLドキュメントのトークン要素に子要素を含めないでください。 パフォーマンスを改善するには、このパラメータの宣言時にNOCOPYヒントを使用してください。NOCOPYヒントによって、データは値ではなく参...
Example: SQL> connect / as sysdba Connected. SQL> show parameter def NAME TYPE VALUE --- --- --- deferred_segment_creation boolean TRUE SQL> alter system set deferred_segment_creation=FALSE; System altered. SQL> show parameter def NAME TYPE...
booleanisNCHAR(int index) isNCHAR (int) voidsetDatabaseChangeRegistration(DatabaseChangeRegistrationregistration) Associate a Database Change Registration object with this statement. voidsetLobPrefetchSize(int value) Overrides the LOB prefetch size for this statement. ...