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1. #Postgresql replace special characters how to#
2. #Postgresql replace special characters update#
3. #Postgresql replace special characters code#

If you have specified the special characters within the function REPLACE() that you want to replace or remove, then REPLACE() function will replace all the matching special characters within a string. It replaces all the string which matches with the substring specified in this function. The REPLACE() function of PostgreSQL replaces the old string value with a new string value. Replace() Function to Replace Special Characters in Postgres

#Postgresql replace special characters how to#

Let’s take some examples and understand how to remove and replace special characters in PostgreSQL with new string values.

PostgreSQL has different kinds of functions which remove or replace special characters with new string values. So what should you do, the answer is to remove or replace these characters according to what you want. Usually, this kind of information with special characters should not exist in the database because it is meaningless or has no value with that information. Maybe this kind of unwanted character gets into your table due to a data conversion problem when Postgresql is unable to understand the information. These special characters can be and sometimes you keep the special character with information purposely.īut sometimes you get these special characters mistakenly or while importing data from other sources into PostgreSQL. Sometimes your database contains a piece of information with special characters in a table. How to Replace Special Characters in Postgres

Translate() to Replace Special Characters in Postgres.REGEXP_REPLACE to Replace Special Characters in Postgres.Replace() Function to Replace Special Characters in Postgres.How to Replace Special Characters in Postgres.Then use it in whatever part of your query that makes sense. This will output: REGEXP_REPLACE(REGEXP_REPLACE('input test string, 'test', '', 'gi'), 'foo', '', 'gi') So that finally, when no more substrings are in the list to remove, the final aggregated query is returned. Then, recursively calls the function again with elements and append each REGEXP query to the passed parameter.

#Postgresql replace special characters code#

The code splits the comma separated string to a list of substrings to remove, Creates a REGEXP_REPLACE function in sql with the first substring. Replace_psql_string("test,foo", "input test string") Return self.replace_psql_string(','.join(ss), query) This is a generic recursive function written in python (but can easily be replicated in whatever language you prefer) That takes in the original string and a list of substrings to be removed: def replace_psql_string(str_to_remove, query): Replace characters with multi-character strings

#Postgresql replace special characters update#

The result of the update is following: Juhanao Updates table so all predefined letters are translated and the change is saved to the database. update xyz set name = translate(name, 'ä,ü,Ü', 'a,u,U') Translates all letters ä to a, ü to u and Ü to U. The result of the update is following: JuhaenaeoĮxample of translate function: select translate(name, 'ä,ü,Ü', 'a,u,U') from xyz update xyz set name = replace(replace(replace(name, 'ä', 'ae'), 'ü', 'ue'), 'Ü', 'Ue') Ĭhanges letters and updates rows. Not very nice, but in the example all ä become ae, ü become ue, and Ü become 'Ue'. select replace(name, 'ä', 'ae') from xyz This function replaces letter ä in the name column with letter a. Some data to play with: drop table if exists xyz Įxample of replace function: select replace(name, 'ä', 'a') from xyz If you want to translate some letters to other letters you can user function translate(string text, from text, to text) that replaces any character in a string that matches a character in the from by the corresponding character in the to set. The replace function can be used to replace one character to several characters. If you want just to replace one or few characters you can use function replace(string text, from text, to text) that replaces all occurrences in string substring.