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Database PL/SQL Language Reference, 11g Release 2 (11.2)

%TYPE Attribute

%TYPE AttributeThe %TYPE attribute lets you declare a constant, variable, collection element, record field, or … subprogram parameter to be of the same data type as a previously declared variable or column (without … knowing what that type is). The item declared with %TYPE is the referencing item, and the previously … referenced

Database SQL Language Reference, 11g Release 2 (11.2)

DROP TYPE

DROP TYPEfor complete information on creating, altering, and dropping object types. Use the DROP TYPE … statement to drop the specification and body of an object type, a varray, or a nested table type … . Prerequisites The object type, varray, or nested table type must be in your own schema or you must have the

Database SQL Language Reference, 11g Release 2 (11.2)

ALTER TYPE

ALTER TYPE… Use the ALTER TYPE statement to add or drop member attributes or methods. You can change the existing … properties ( FINAL or INSTANTIABLE ) of an object type, and you can modify the scalar attributes of … the type. You can also use this statement to recompile the specification or body of the type or to

Database SQL Language Reference, 11g Release 2 (11.2)

CREATE TYPE

CREATE TYPE… Use the CREATE TYPE statement to create the specification of an object type, a SQLJ object type, a … named varying array ( varray ), a nested table type, or an incomplete object type. You create object … types with the CREATE TYPE and the CREATE TYPE BODY statements.

Database SQL Language Reference, 11g Release 2 (11.2)

Data Type Comparison Rules

Table 3-9 EBCDIC Character SetSymbol Decimal value Symbol Decimal value blank 64 % 108 ¢ 74 _ 109. 75 > 110 < 76 ? 111 ( 77: 122 + 78 # 123 | 79 @ 124 & 80 ' 125 ! 90 = 126 $ 91 \" 127 * 92 a-i 129-137 ) 93 j-r 145-153. 94 s-z 162-169 ÿ 95 A-I 193-201 - 96 J-R 209-217 / 97 S-Z 226-233

Database SQL Language Reference, 11g Release 2 (11.2)

Data Type Comparison Rules

Object Valuescompare object type instances, but they are quite different from one another. These functions must be … specified as part of any object type that will be compared with other object types. See Also: CREATE … TYPE for a description of MAP and ORDER methods and the values they return

Database SQL Language Reference, 11g Release 2 (11.2)

Data Type Comparison Rules

CHAR VARCHAR2 NCHAR NVARCHAR2 DATE DATETIME/INTERVAL NUMBER BINARY_FLOAT BINARY_DOUBLE LONG RAW ROWID…following rules govern implicit data type conversions: During INSERT and UPDATE operations, Oracle … converts the value to the data type of the affected column. During SELECT FROM operations, Oracle … converts the data from the column to the type of the target variable. When manipulating numeric values … data type

Database SQL Language Reference, 11g Release 2 (11.2)

Data Type Comparison Rules

to CHAR,VARCHAR2,NCHAR,NVARCHAR2 to NUMBER to Datetime/Interval to RAW to ROWID to LONG,LONG RAW to…from CHAR, VARCHAR2, NCHAR, NVARCHAR2 TO_CHAR (char.) TO_NCHAR (char.) TO_NUMBER TO_DATE TO_TIMESTAMP TO_TIMESTAMP_TZ TO_YMINTERVAL TO_DSINTERVAL HEXTORAW CHARTO­=ROWID -- TO_CLOB TO_NCLOB TO_BINARY_FLOAT TO_BINARY_DOUBLE from NUMBER TO_CHAR (number) TO_NCHAR (number) -- TO_DATE NUMTOYM- INTERVAL NUMTODS- INTERVAL -- -- -- -- TO_BINARY_FLOAT TO_BINARY_DOUBLE from Datetime/ Interval TO_CHAR (date)

Database SQL Language Reference, 11g Release 2 (11.2)

Data Type Comparison Rules

Implicit Data Conversion ExamplesText Literal Example  The text literal '10' has data type CHAR. Oracle implicitly converts it to … the NUMBER data type if it appears in a numeric expression as in the following statement: SELECT

Database SQL Language Reference, 11g Release 2 (11.2)

CREATE TYPE BODY

CREATE TYPE BODYPurpose Type bodies are defined using PL/SQL. Therefore, this section provides some general … . Use the CREATE TYPE BODY to define or implement the member methods defined in the object type … specification. You create object types with the CREATE TYPE and the CREATE TYPE BODY statements. The CREATE

Database SQL Language Reference, 11g Release 2 (11.2)

Data Type Comparison Rules

Date ValuesA later date is considered greater than an earlier one. For example, the date equivalent of '29-MAR-2005' is less than that of '05-JAN-2006' and '05-JAN-2006 1:35pm' is greater than '05-JAN-2005 10:09am'.

Database SQL Language Reference, 11g Release 2 (11.2)

Data Type Comparison Rules

Table 3-8 ASCII Character SetSymbol Decimal value Symbol Decimal value blank 32. 59 ! 33 62 $ 36 ? 63 % 37 @ 64 & 38 A-Z 65-90 ' 39 [ 91 ( 40 \\ 92 ) 41 ] 93 * 42 ^ 94 + 43 _ 95, 44 ' 96 - 45 a-z 97-122. 46 { 123 / 47 | 124 0-9 48-57 } 125: 58 ~ 126

Database SQL Language Reference, 11g Release 2 (11.2)

Data Type Comparison Rules

Data Conversioncannot multiply 5 by 10 and then add 'JAMES'. However, Oracle supports both implicit and explicit conversion of values from one data type to another.

Database SQL Language Reference, 11g Release 2 (11.2)

Data Type Comparison Rules

Implicit and Explicit Data Conversiontype conversion functions. Implicit data type conversion can have a negative impact on performance … , especially if the data type of a column value is converted to that of a constant rather than the … of explicit conversions is more predictable. If implicit data type conversion occurs in an index … data type.

Database SQL Language Reference, 11g Release 2 (11.2)

Data Type Comparison Rules

Implicit Data ConversionOracle Database automatically converts a value from one data type to another when such a conversion … rules governing these details follow the table. Table 3-10 Implicit Type Conversion Matrix

Database SQL Language Reference, 11g Release 2 (11.2)

Data Type Comparison Rules

Explicit Data ConversionYou can explicitly specify data type conversions using SQL conversion functions. Table 3-12 shows … SQL functions that explicitly convert a value from one data type to another. You cannot specify LONG … and LONG RAW values in cases in which Oracle can perform implicit data type conversion. For example … Data Type\"

Database SQL Language Reference, 11g Release 2 (11.2)

IS OF type Condition

IS OF type ConditionUse the IS OF type condition to test object instances based on their specific type information … EXECUTE privilege on all types referenced by type, and all type s must belong to the same type family … specific type of expr is the subtype of one of the types specified in the type

Database PL/SQL Language Reference, 11g Release 2 (11.2)

CREATE TYPE Statement

CREATE TYPE StatementThe CREATE TYPE statement creates or replaces the specification of one of these: Abstract Data Type … (ADT) (including a SQLJ object type) Standalone varying array (varray) type Standalone nested table … type Incomplete object type An incomplete type is a type

Database SQL Language Reference, 11g Release 2 (11.2)

Data Type Comparison Rules

Numeric ValuesA larger value is considered greater than a smaller one. All negative numbers are less than zero and all positive numbers. Thus, -1 is less than 100; -100 is less than -1. The floating-point value NaN (not a number) is greater than any other numeric value and is equal to itself. See Also: \"Numeric Precedence\" and \"Floating-Point Numbers\" for more information on comparison semantics

Database SQL Language Reference, 11g Release 2 (11.2)

Data Type Comparison Rules

Character Valuescomparison are either expressions of data type CHAR, NCHAR, text literals, or values returned by the USER … in the comparison have the data type VARCHAR2 or NVARCHAR2. The results of comparing two character





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