MYSQL: Update a column value from a substring in another column?

I have the following MYSQL table:

Job | Applicant  | link_Id

1    job_blogs_123    ?

2    steve_jobs_445  ?

The link_Id column in my table is currenty null for all rows.

I want it to be the substring after the last _ in the Applicant column. So in this case 123 and 445.

How can I write a query that will update all the rows in my table in this way?

Answers:

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Method 1

Use SUBSTRING_INDEX:

UPDATE yourTable
SET link_Id = SUBSTRING_INDEX(Applicant, '_', -1);


All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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