How to Replace First Three Characters Of A String In Oracle?

4 minutes read

To replace the first three characters of a string in Oracle, you can use the SUBSTR function along with concatenation. Here is an example:

1
2
SELECT CONCAT('new', SUBSTR(column_name, 4)) AS modified_string
FROM table_name;


In this query, 'new' is the three characters that you want to replace the existing first three characters with. The SUBSTR function is used to extract the remaining characters starting from the fourth position in the original string. The CONCAT function is then used to concatenate 'new' with the extracted substring to create the modified string.


What is the function for changing characters in a string in Oracle?

The function for changing characters in a string in Oracle is REPLACE.


Syntax: REPLACE(original_string, old_substring, new_substring)


Example: SELECT REPLACE('Hello World', 'World', 'Universe') FROM dual;


This query will return 'Hello Universe'.


How to substitute characters in a string in Oracle?

In Oracle, you can use the REPLACE function to substitute characters in a string.


The syntax for the REPLACE function is:

1
REPLACE(string, search_string, replacement_string)


  • string: the original string where you want to substitute characters
  • search_string: the character or string you want to replace
  • replacement_string: the character or string you want to replace search_string with


For example, if you have a string "hello world" and you want to replace all occurrences of the letter "o" with the letter "x", you can use the following query:

1
SELECT REPLACE('hello world', 'o', 'x') AS new_string FROM dual;


This will return the result: hellx wxrld


You can also use the TRANSLATE function in Oracle to substitute characters in a string.


The syntax for the TRANSLATE function is:

1
TRANSLATE(string, from_string, to_string)


  • string: the original string where you want to substitute characters
  • from_string: the characters you want to replace
  • to_string: the characters you want to replace from_string with


For example, to replace all occurrences of the characters "abc" with "123" in the string "abc123abc", you can use the following query:

1
SELECT TRANSLATE('abc123abc', 'abc', '123') AS new_string FROM dual;


This will return the result: 123123123


What is the syntax for replacing characters based on a specific condition in a string in Oracle?

In Oracle, you can use the REGEXP_REPLACE function to replace characters based on a specific condition in a string.


The syntax for using REGEXP_REPLACE is as follows:

1
REGEXP_REPLACE(input_string, pattern, replacement)


In this syntax:

  • input_string is the string that you want to search and replace characters in.
  • pattern is the regular expression pattern that specifies the condition for replacing characters.
  • replacement is the string that will replace the characters that match the pattern.


For example, if you want to replace all the digits in a string with the character 'X', you can do so with the following query:

1
SELECT REGEXP_REPLACE('abc123def456ghi789', '\d', 'X') AS modified_string FROM dual


This query will return the string 'abcXXXdefXXXghiXXX'. Here, '\d' is the regular expression pattern that matches any digit in the input string, and 'X' is the replacement string.


How to trim whitespace characters from the beginning of a string in Oracle?

You can trim whitespace characters from the beginning of a string in Oracle using the LTRIM function. Here is an example:

1
2
SELECT LTRIM('    Hello World') AS trimmed_string
FROM dual;


This query will return the string 'Hello World' with whitespace characters trimmed from the beginning. You can replace ' Hello World' with the name of your column or string variable.


How to replace specific characters in a string in Oracle?

To replace specific characters in a string in Oracle, you can use the REPLACE function. Here is an example of how to replace all occurrences of a specific character with another character in a string:

1
2
SELECT REPLACE('Hello World', 'o', '0') as new_string
FROM dual;


This query will replace all occurrences of the character 'o' with the character '0' in the string 'Hello World', resulting in the output:

1
2
3
new_string
-----------
Hell0 W0rld


You can also replace multiple characters by chaining the REPLACE function multiple times, like this:

1
2
SELECT REPLACE(REPLACE('Hello World', 'o', '0'), 'l', '1') as new_string
FROM dual;


This query will first replace all occurrences of 'o' with '0', and then replace all occurrences of 'l' with '1', resulting in the output:

1
2
3
new_string
-----------
He110 W0r1d


You can use the REPLACE function in combination with other string functions in Oracle to achieve more complex string manipulation tasks.

Facebook Twitter LinkedIn Telegram

Related Posts:

In PostgreSQL, you can replace a value in a URL using the REPLACE function. The syntax for the REPLACE function is as follows: REPLACE(string, old_substring, new_substring) You can use this function to replace a specific value in a URL by selecting the URL col...
To select a table using a string in Oracle, you can use dynamic SQL. Dynamic SQL allows you to construct SQL statements at runtime and execute them using the EXECUTE IMMEDIATE statement.To select a table using a string in Oracle, you would first construct a SQ...
To create a new Oracle database with Hibernate, you will first need to set up an Oracle database server and install the necessary software. Make sure you have the Oracle JDBC driver in your project’s classpath.Next, configure the Hibernate properties in your a...
To return a Vec<String> from a collection in Rust, you can simply collect the values from the collection into a new Vec<String>.For example, if you have a collection such as a HashSet<String>, you can call the iter() method on the set to get ...
To iterate prefixes and suffixes of a string in Rust, you can use the windows() method on the string slice to create an iterator over substrings of a specified length. For prefixes, you can start with a length of 1 and increment it until you reach the length o...