Symbolic Oracle functions
| Function | Description |
| ASCII | The Oracle/PLSQL ASCII function returns the numeric representation of the leftmost character of the string. |
| ASCIISTR | The Oracle/PLSQL ASCIISTR function converts a string of any character set to an ASCII string using the database character set. |
| CHR | The Oracle/PLSQL CHR function is the opposite of the ASCII function. CHR returns a character that is based on numeric code. |
| COMPOSE | The Oracle/PLSQL COMPOSE function returns the Unicode string. |
| CONCAT | The Oracle/PLSQL CONCAT function allows two lines to be connected together. |
| THE CONCATENATION OPERATOR || | Oracle/PLSQL concatenation operator || allows to combine two or more lines together. |
| DUMP | The Oracle/PLSQL DUMP function returns a value of varchar2, which includes data type code, length in bytes, and the internal representation of the expression. |
| INITCAP | The Oracle/PLSQL INITCAP function sets the first character of each word in upper case, and the rest in lower case. |
| INSTR | The Oracle/PLSQL function INSTR returns the n-th occurrence of a substring in a string. |
| INSTR2 | The Oracle/PLSQL INSTR2 function returns substring occurrence in a string using UCS2 code points. |
| INSTR4 | The Oracle/PLSQL INSTR4 function returns substring occurrence in a string using UCS4 code points. |
| INSTRB | The Oracle/PLSQL INSTRB function returns substring occurrence in a string, bytes instead of characters. |
| INSTRC | The Oracle/PLSQL INSTRC function returns substring occurrence to a string using Unicode full characters. |
| LENGTH | The Oracle/PLSQL LENGTH function returns the length of the specified string. |
| LENGTH2 | The Oracle/PLSQL LENGTH2 function returns the length of the specified string using UCS2 code points. |
| LENGTH4 | Function In this tutorial you will learn that LENGTH4 returns the length of a specified string using UCS4 code points. |
| LENGTHB | The Oracle/PLSQL LENGTHB function returns the length of the specified string using bytes instead of characters. |
| LENGTHC | The Oracle/PLSQL LENGTHC function returns the length of the specified string using full Unicode characters. |
| LOWER | The Oracle/PLSQL LOWER function converts all characters in a specified string into lower case. If there are characters in the string that are not letters, they do not affect this function. |
| LPAD | The Oracle/PLSQL LPAD function adds a certain set of characters from the left side of the string (at non-zero string1). |
| LTRIM | The Oracle/PLSQL LTRIM function removes all specified characters from the left side of the string. |
| NCHR | The Oracle/PLSQL NCHR function returns a character based on number_code in the national encoding. |
| REGEXP_INSTR | Function Oracle/PLSQL REGEXP_INSTR is an extension of function INSTR. It returns the regular expression template location in the string. This function, presented in Oracle 10g, will allow you to find a substring in a string using a regular expression pattern mapping. |
| REGEXP_LIKE | The Oracle condition REGEXP_LIKE allows regular expressions in the WHERE sentence in SELECT, INSERT, UPDATE or DELETE queries. |
| REGEXP_REPLACE | The function Oracle/PLSQL REGEXP_REPLACE is an extension of the function REPLACE. This function, introduced in Oracle 10g, allows you to replace a sequence of characters in a string with a different set of characters using regular expression pattern mapping. |
| REGEXP_SUBSTR | Function Oracle/PLSQL REGEXP_SUBSTR is an extension of function SUBSTR. This function, represented in Oracle 10g, allows you to extract substring from a string using regular expression pattern matching. |
| REPLACE | The Oracle/PLSQL REPLACE function replaces a sequence of characters in a string with another character set. |
| RPAD | The Oracle/PLSQL RPAD function supplements a certain character set from the right side of the string (at non-zero string1). |
| RTRIM | The Oracle/PLSQL RTRIM function removes all specified characters from the right side of the string. |
| SOUNDEX | The Oracle/PLSQL SOUNDEX function returns the phonetic representation (as it sounds) of the string. |
| SUBSTR | The Oracle/PLSQL SUBSTR function allows extracting a substring from a string. |
| TO_CHAR | The Oracle/PLSQL TO_CHAR function converts a number or date into a string. |
| TRANSLATE | The Oracle/PLSQL TRANSLATE function replaces the sequence of characters in a string with another character set. However, it replaces one character at a time. For example, it replaces the first character in string_to_replace with the first character in replacement_string. Then the second character in string_to_replace with the second character in replacement_string will be replaced, and so on. |
| TRIM | The Oracle / PLSQL TRIM function removes all specified characters from the beginning or end of a string. |
| UPPER | The Oracle/PLSQL UPPER function converts all characters of a string into upper case. If there are characters in a string that are not letters, they do not affect this function. |
| VSIZE | The Oracle/PLSQL VSIZE function returns the length in bytes for the internal representation of the expression. |
Introduction to PL/SQL functions in Oracle Database
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