postgres \d t Table 'public.t' Column Type Modifiers -+-+- s text postgres SELECT s, md5 ( s ), replace ( replace ( replace ( s, E' ', ' ' ), E'\t', '\t' ), E'\r', '\r' ) FROM t s md5 replace. That said, MySQL recognizes several C-style character escapes in strings, including both r and n a CRLF in a MySQL string is therefore just rn. You can find details here, here and here. In this tutorial, we have discussed how to replace strings using PostgreSQL replace() and regexp_replace functions and how the replace() function can be used to update strings in a table. If possible, youd probably be better off doing this sort of replacement in your language of choice, which will offer stronger string handling capabilities than MySQL. UPDATE demo SET text = replace( text, 'Red', 'Yellow') UPDATE demo SET text = replace( text, '-', '_') UPDATE demo SET text = replace( text, 'red', 'yellow') -view all the changes INSERT INTO demo ( text) VALUES ( 'She bought a red bag'), ( 'Green is a good color'), ( 'The sky is blue'), ( 'The color of the shirt is red'), ( 'They plan to go with blue or red balloons') -update statements that include the REPLACE function INSERT INTO demo ( text) VALUES ( 'Red'), ( 'Green'), ( 'Blue'), ( 'Red'), ( 'Red') -insert second set of records The RTRIM() function removes all characters, spaces by default, from the end of a string. If a column list is specified, COPY TO copies only the data. COPY TO can also copy the results of a SELECT query. COPY TO copies the contents of a table to a file, while COPY FROM copies data from a file to a table (appending the data to whatever is in the table already). The LTRIM() function removes all characters, spaces by default, from the beginning of a string. COPY moves data between PostgreSQL tables and standard file-system files. PostgreSQL provides you with LTRIM, RTRIM() and BTRIM functions that are the shorter version of the TRIM() function. CREATE TABLE demo ( id INTEGER PRIMARY KEY GENERATED ALWAYS AS IDENTITY, text TEXT NOT NULL ) -insert first set of records PostgreSQL LTRIM, RTRIM, and BTRIM functions.
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