What are the functions to remove spaces in mysql?

There are 4 functions that can remove spaces: 1. The replace() function can replace the spaces in the string with null characters to remove all spaces. The syntax is "replace(string,' ',' ')"; 2. The trim() function can remove the spaces at the beginning and end of the string, the syntax is "TRIM(string)"; 3. The LTRIM() function can remove the spaces on the left side of the string, the syntax is "LTRIM(string)" )"; 4. The RTRIM() function can remove the spaces on the right side of the string, the syntax is "RTRIM(string)".

The operating environment of this tutorial: windows7 system, mysql8 version, Dell G3 computer.

There are several commonly used methods to clear string spaces in mysql:

• One is to use the trim function, which has two branches: LTRIM and RTRIM functions
  

• The other is to directly replace the character replacement function to clear it

1. Use the mysql replace function to remove spaces

Syntax: replace(object,search,replace)

Meaning: Replace all occurrences of search in object with replace

Case: Clear news Spaces in the content field in the table

update `news` set `content`=replace(`content`,' ','');

Note: The replace function can also be used to remove a certain character

• Remove all specified ordinary characters in the string, such as: [

update  table  set column1= REPLACE(column1,'[','') ;

• Remove all specified special characters in the string, such as: single quote ', please note that you need to use backslash\escaping

update  table  set column1= REPLACE(column1,'\'','') ;

2. Use the mysql trim function to remove leading and trailing spaces

Full format: TRIM([{BOTH | LEADING | TRAILING} [remstr] FROM] str)

Simplified format: TRIM([remstr FROM] str)

The following examples:

mysql> SELECT TRIM(' phpernote  '); 
-> 'phpernote'

mysql> SELECT TRIM(LEADING 'x' FROM 'xxxphpernotexxx'); 
-> 'phpernotexxx'

mysql> SELECT TRIM(BOTH 'x' FROM 'xxxphpernotexxx'); 
-> 'phpernote'

3, Use the mysql LTRIM function to remove left spaces

Syntax: LTRIM(str)

Example:

mysql> SELECT LTRIM(' barbar');
-> 'barbar'

4 , use mysql RTRIM function to remove right spaces

Syntax: RTRIM(str)

Example:

mysql> SELECT RTRIM('barbar ');
-> 'barbar'

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