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Snippet Name: TO_BINARY_DOUBLE

Description: TO_BINARY_DOUBLE returns a double-precision floating-point number.

expr can be a character string or a numeric value of type NUMBER, BINARY_FLOAT, or BINARY_DOUBLE. If expr is BINARY_DOUBLE, then the function returns expr.

The optional 'fmt' and 'nlsparam' arguments are valid only if expr is a character string. They serve the same purpose as for the TO_CHAR (number) function.

o The case-insensitive string 'INF' is converted to positive infinity.
o The case-insensitive string '-INF' is converted to negative identity.
o The case-insensitive string 'NaN' is converted to NaN (not a number).

You cannot use a floating-point number format element (F, f, D, or d) in a character string expr.

Conversions from character strings or NUMBER to BINARY_DOUBLE can be inexact, because the NUMBER and character types use decimal precision to represent the numeric value, and BINARY_DOUBLE uses binary precision.

Conversions from BINARY_FLOAT to BINARY_DOUBLE are exact.

Also see:
» Add PSOUG Search to SQL Developer
» Converting Rows to Columns
» UNISTR
» TRANSLATE
» TO_YMINTERVAL
» TO_TIMESTAMP_TZ
» TO_TIMESTAMP
» TO_SINGLE_BYTE
» TO_NUMBER
» TO_NCLOB
» TO_NCHAR
» TO_MULTI_BYTE
» TO_LOB
» TO_DSINTERVAL
» TO_DATE
» TO_CLOB
» TO_CHAR
» TO_BINARY_FLOAT
» TIMESTAMP_TO_SCN
» SCN_TO_TIMESTAMP
» ROWIDTONCHAR
» ROWIDTOCHAR
» REFTOHEX
» RAWTONHEX
» RAWTOHEX
» NUMTOYMINTERVAL
» NUMTODSINTERVAL
» HEXTORAW
» DECOMPOSE
» CONVERT

Comment: (none)

Language: PL/SQL
Highlight Mode: PLSQL
Last Modified: March 05th, 2009

TO_BINARY_DOUBLE(<value>);
 
 
-- The examples that follow are based on a table with three 
-- columns, each with a different numeric datatype:
 
CREATE TABLE float_point_demo
  (dec_num NUMBER(10,2), bin_double BINARY_DOUBLE, bin_float BINARY_FLOAT);
 
INSERT INTO float_point_demo
  VALUES (1234.56,1234.56,1234.56);
 
SELECT * FROM float_point_demo;
 
   DEC_NUM BIN_DOUBLE  BIN_FLOAT
---------- ---------- ----------
   1234.56 1.235E+003 1.235E+003
 
 
 
-- This example converts a value of datatype NUMBER to 
-- a value of datatype BINARY_DOUBLE:
 
SELECT dec_num, TO_BINARY_DOUBLE(dec_num)
  FROM float_point_demo;
 
   DEC_NUM TO_BINARY_DOUBLE(DEC_NUM)
---------- -------------------------
   1234.56                1.235E+003
 
 
 
-- This example compares extracted dump information 
-- from the dec_num and bin_double columns:
 
SELECT DUMP(dec_num) "Decimal",
   DUMP(bin_double) "Double"
   FROM float_point_demo;
 
DECIMAL                     Double
--------------------------- ---------------------------------------------
Typ=2 Len=4: 194,13,35,57   Typ=101 Len=8: 192,147,74,61,112,163,215,10
 
 


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