I want to match two tables based on a specific column which is a card number, there are spaces between characters in some of card numbers in the second table like below:

'NES 123_4_5'
'MTS 678_9_0'

What i want is to remove the space between the characters and numbers and change it to following form:


What would be the SQL query of function to do this?

2 Answers 2


simplest way - use REPLACE function

select REPLACE('NES 123_4_5', ' ', '')
Result - NES123_4_5

full list of string functions - https://www.postgresql.org/docs/9.6/static/functions-string.html

  • 1
    If we want to do this for an entire column we can update the column: update TableName set ColumnName = REPLACE (ColumnName,' ',''); Oct 30, 2016 at 10:21
  • Yes of course if You need update column - You update using this function, but if for any reason You must leave column in original state You can use functions in SELECT
    – a_vlad
    Oct 30, 2016 at 10:33

If you want to replace all spaces, use replace()

replace('NES 123_4_5', ' ', '')

If you only want to replace the space after the first three characters, you can use regexp_replace()

regexp_replace('NES 123_4_5', '(^[A-Z]{3})( )', '\1')

The regular expression will look for there (uppercase) characters at the beginning followed by a single space and will remove that space

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