How Can I Quickly Replace Multiple Characters in a MySQL Field?

Replacing Multiple Characters in MySQL

When faced with the task of modifying numerous characters in a MySQL field, the REPLACE function falls short, as it is designed for single-character replacements.

Can It Be Done Quickly?

Yes! MySQL offers a solution: chaining REPLACE functions.

select replace(replace('hello world','world','earth'),'hello','hi')

This command replaces "hello" with "hi" and "world" with "earth," resulting in "hi earth."

Advanced Techniques for Multiple Replacements

For more complex replacements, subqueries and JOINs can be employed:

Subqueries:

select replace(london_english,'hello','hi') as warwickshire_english
from (
    select replace('hello world','world','earth') as london_english
) sub

This subquery replaces "hello" with "hi" in the "london_english" field.

JOINs:

select group_concat(newword separator ' ')
from (
    select 'hello' as oldword
    union all
    select 'world'
) orig
inner join (
    select 'hello' as oldword, 'hi' as newword
    union all
    select 'world', 'earth'
) trans on orig.oldword = trans.oldword

This JOIN combines two tables to replace multiple characters in a single query.

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