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== Conversion Functions==

Function
Description
ASCIISTR(x)
Converts x to an ASCII string, where x may be a string in any character set.
BIN_TO_NUM(x)
Converts x to a binary number. Returns a NUMBER.
CAST(x AS type_name)
Converts a value in x from one data type to another specified in type_name.
CHARTOROWID(x)
Converts x to a ROWID.
COMPOSE(x)
Converts x to a Unicode string in its fully normalized form in the same character set as x. Unicode uses a 2-byte character set and can represent over 65,000 characters; it may also be used to represent non-English characters.
CONVERT(x, source_char_set, dest_char_set)
Converts x from source_char_set to dest_char_set.
DECODE(x, search, result, default)
Compares x with the value in search; if equal, DECODE() returns search, otherwise the value in default is returned.
DECOMPOSE(x)
Converts x to a Unicode string after decomposition in the same character set as x.
HEXTORAW(x)
Converts the character x containing hexadecimal digits (base 16) to a binary number (RAW). This function returns the returns RAW number.
NUMTODSINTERVAL(x)
Converts the number x to an INTERVAL DAY TO SECOND. You"ll learn about date and time intervalCrelated functions in the next chapter.
NUMTOYMINTERVAL(x)
Convert the number x to an INTERVAL YEAR TO MONTH.
RAWTOHEX(x)
Converts the binary number (RAW) x to a VARCHAR2 character containing the equivalent hexadecimal number.
RAWTONHEX(x)
Converts the binary number (RAW) x to an NVARCHAR2 character containing the equivalent hexadecimal number. An NVARCHAR2 is used to store strings in the national character set.
ROWIDTOCHAR(x)
Converts the ROWID x to a VARCHAR2 character.
ROWIDTONCHAR(x)
Converts the ROWID x to an NVARCHAR2 character.
TO_BINARY_DOUBLE(x)
New for Oracle Database 10g. Converts x to a BINARY_DOUBLE.
TO_BINARY_FLOAT(x)
New for Oracle Database 10g. Converts x to a BINARY_FLOAT.
TO_CHAR(x [, format])
Converts x to a VARCHAR2 string. You can supply an optional format that indicates the format of x.
TO_CLOB(x)
Converts x to a character large object (CLOB). A CLOB is used to store large amounts of character data.
TO_DATE(x [, format])
Converts x to a DATE.
TO_DSINTERVAL(x)
Convert the string x to an INTERVAL DAY TO SECOND.
TO_MULTI_BYTE(x)
Converts the single-byte characters in x to their corresponding multi-byte characters. The return type is the same as the type for x.
TO_NCHAR(x)
Converts x in the database character set to an NVARCHAR2.
TO_NCLOB(x)
Converts x to an NCLOB. An NCLOB is used to store large amounts of national language character data.
TO_NUMBER(x [, format])
Converts x to a NUMBER.
TO_SINGLE_BYTE(x)
Converts the multi-byte characters in x to their corresponding single-byte characters. The return type is the same as the type for x.
TO_TIMESTAMP(x)
Converts the string x to a TIMESTAMP.
TO_TIMESTAMP_TZ(x)
Converts the string x to a TIMESTAMP WITH TIME ZONE.
TO_YMINTERVAL(x)
Converts the string x to an INTERVAL YEAR TO MONTH.
TRANSLATE(x, from_string, to_string)
Converts all occurrences of from_string in x to to_string.
UNISTR(x)
Converts the characters in x to the national language character set (NCHAR).
Quote from:
Oracle Database 10g SQL (Osborne ORACLE Press Series) (Paperback)
# Paperback: 608 pages
# Publisher: McGraw-Hill Osborne Media; 1st edition (February 20, 2004)
# Language: English
# ISBN-10: 0072229810
# ISBN-13: 978-0072229813

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